-
And one more at high mag (FOV 4.65x5.9mm), looking at the truncated apex of the interior phantom octahedron (a little below and to the right of the center of the frame). (Author: Gerhard Niklasch)
And one more at high mag (FOV 4.65
-
Benitoite on/in Natrolite on matrix; Dallas Gem Mine, San Benito Co., California, USA.
Length of specimen about 15mm, Benitoite xx to 3mm. GN’s collection id 09USBnjm2.
Stereo pair.
Stereo microscope, eyepiece projection; blue fluorescence under shortwave UV. (Author: Gerhard Niklasch)
Benitoite on/in N
Length of specime -
Benitoite on/in Natrolite on matrix, with minor brown grains of a Joaquinite group mineral; Dallas Gem Mine, San Benito Co., California, USA.
Length of specimen about 15mm, Benitoite xx to 3mm. GN’s collection id 09USBnjm2.
Stereo microscope, eyepiece projection; halogen incandescent light with white LED fill-in / blue fluorescence under shortwave UV. (Author: Gerhard Niklasch)
Benitoite on/in N
Length of specime -
Benitoite on/in Natrolite on matrix, with minor brown grains of a Joaquinite group mineral; Dallas Gem Mine, San Benito Co., California, USA.
Length of specimen about 15mm, Benitoite xx to 3mm. GN’s collection id 09USBnjm2.
Stereo pair.
Stereo microscope, eyepiece projection; halogen incandescent light with white LED fill-in. (Author: Gerhard Niklasch)
Benitoite on/in N
Length of specime -
Benitoite on/in Natrolite on matrix, with minor brown grains of a Joaquinite group mineral; Dallas Gem Mine, San Benito Co., California, USA.
Length of specimen about 15mm, Benitoite xx to 3mm. GN’s collection id 09USBnjm2.
Taken in direct sunlight.
Stereo pair. (Author: Gerhard Niklasch)
Benitoite on/in N
Length of specime -
Benitoite on/in Natrolite on matrix, with minor brown grains of a Joaquinite group mineral; Dallas Gem Mine, San Benito Co., California, USA.
Length of specimen about 15mm, Benitoite xx to 3mm. GN’s collection id 09USBnjm2.
Stereo microscope, eyepiece projection; halogen incandescent light with white LED fill-in. (Author: Gerhard Niklasch)
Benitoite on/in N
Length of specime -
Beryl var.Aquamarine with inclusions; northern Pakistan.
Diam. 7mm x 13mm. GN’s collection id 09PKB-002.
Stereo pair, field of view about 1.2x2mm. (Author: Gerhard Niklasch)
Beryl var.Aquamar
Diam. 7mm x 13mm. -
Beryl var.Aquamarine with inclusions; northern Pakistan.
Diam. 7mm x 13mm. GN’s collection id 09PKB-002.
Stereo pair, field of view about 2.6x3.8mm. Same region as previous shot, but seen through the next prism face. (Author: Gerhard Niklasch)
Beryl var.Aquamar
Diam. 7mm x 13mm. -
Beryl var.Aquamarine with inclusions; northern Pakistan.
Diam. 7mm x 13mm. GN’s collection id 09PKB-002.
Stereo pair, field of view about 2.2x4.4mm. (Author: Gerhard Niklasch)
Beryl var.Aquamar
Diam. 7mm x 13mm. -
Beryl var.Aquamarine with inclusions; northern Pakistan.
Diam. 7mm x 13mm. GN’s collection id 09PKB-002.
Stereo pair, field of view about 3.5mm tall. (Author: Gerhard Niklasch)
Beryl var.Aquamar
Diam. 7mm x 13mm. -
Beryl var.Aquamarine with inclusions; northern Pakistan.
Diam. 7mm x 13mm. GN’s collection id 09PKB-002.
Taken in direct sunlight. (Author: Gerhard Niklasch)
Beryl var.Aquamar
Diam. 7mm x 13mm. -
Beryl var.Aquamarine with growth channels; northern Pakistan.
Diam. 9mm x 13mm. GN’s collection id 09PKB-001.
Stereo pair. (Author: Gerhard Niklasch)
Beryl var.Aquamar
Diam. 9mm x 13mm. -
Beryl var.Aquamarine with growth channels; northern Pakistan.
Diam. 9mm x 13mm. GN’s collection id 09PKB-001.
Stereo pair. (Author: Gerhard Niklasch)
Beryl var.Aquamar
Diam. 9mm x 13mm. -
Beryl var.Aquamarine with growth channels; northern Pakistan.
Diam. 9mm x 13mm. GN’s collection id 09PKB-001.
Stereo pair, taken in direct sunlight. (Author: Gerhard Niklasch)
Beryl var.Aquamar
Diam. 9mm x 13mm. -
Beryl var.Aquamarine with growth channels; northern Pakistan.
Diam. 9mm x 13mm. GN’s collection id 09PKB-001.
Taken in direct sunlight. (Author: Gerhard Niklasch)
Beryl var.Aquamar
Diam. 9mm x 13mm. -
Birefringent Dolomite (detail); Cantera Azkárate, Eugi (Eugui), Esteribar, Navarre (Navarra), España.
Field of view about 15mm square. GN’s collection id 09ESDm001.
Stereo microscope, eyepiece projection, halogen + white LED illumination. (Author: Gerhard Niklasch)
Birefringent Dolo
Field of view abo -
Celestine, Madagascar, detail. GN’s collection id 09MGC-001. (Author: Gerhard Niklasch)
Celestine, Madagascar, detail. GN&
-
Celestine, Madagascar. 110x90x75mm, xx to >40mm. GN’s collection id 09MGC-001. (Author: Gerhard Niklasch)
Celestine, Madagascar. 110x90x75mm
-
Close-up looking at the inclusions - as far as I can tell, there’s both galena (the lustrous octahedra) and sphalerite (the rougher shapeless grains) among them. At this magnification (FOV 10.9x18.1mm), it becomes obvious that they sit on an otherwise almost invisible interior phantom which is mostly octahedral, except the corner pointing towards us is truncated by a small cube face, oriented the same way as the one through which we’re looking. (Author: Gerhard Niklasch)
Close-up looking at the inclusions
-
Fluorite and a nautilus of Aurichalcite on hematite-coated Quartz on matrix
Is Murvonis mine, Carbonia-Iglesias, Sardegna IT (Author: Gerhard Niklasch)
Fluorite and a na
Is Murvonis mine, -
Fluorite, Mexico, 26x26x20mm, xx to 17mm edge, composite of four views.
Diffuse daylight, plus fill-in flash in some of the shots. (Author: Gerhard Niklasch)
Fluorite, Mexico,
Diffuse daylight, -
Fluorite, Mexico, 26x26x20mm, xx to 17mm edge, detail.
Stereo pair, front and back lighting, field of view about 15mm wide. (Author: Gerhard Niklasch)
Fluorite, Mexico,
Stereo pair, fron -
Fluorite, Xianghuapu, Chenzhou, HuNan CN
(Ok so I need to take a better picture of you... on my long to-do list...) (Author: Gerhard Niklasch)
Fluorite, Xianghu
(Ok so I need to -
Head view, crossed-eye stereo pair (Author: Gerhard Niklasch)
Head view, crossed-eye stereo pair
-
Iridescent Goethite; Tharsis, Huelva, Andalucía, España.
37mm tall. GN’s collection id 09ESG-001.
Stereo pair, taken in direct sunlight. (Author: Gerhard Niklasch)
Iridescent Goethi
37mm tall. GN&rsq -
Iridescent Goethite; Tharsis, Huelva, Andalucía, España.
37mm tall. GN’s collection id 09ESG-001.
Taken in direct sunlight. (Author: Gerhard Niklasch)
Iridescent Goethi
37mm tall. GN&rsq -
Iridescent Goethite; Tharsis, Huelva, Andalucía, España.
37mm tall. GN’s collection id 09ESG-001.
Stereo pair, taken in direct sunlight. (Author: Gerhard Niklasch)
Iridescent Goethi
37mm tall. GN&rsq -
Iridescent Goethite; Tharsis, Huelva, Andalucía, España.
37mm tall. GN’s collection id 09ESG-001.
Taken in direct sunlight. (Author: Gerhard Niklasch)
Iridescent Goethi
37mm tall. GN&rsq -
Magnifying even more (FOV 4.3x5.7mm) and looking at one edge of the phantom, whose apex is near the top right corner of the frame, we see that the galena/sphalerite grains rest just on the outside of the phantom shape, while small fibers of metallic luster sit just below the phantom surface.
The outer top face of the Fluorite through which we’re looking is almost invisible now! If you look around a bit, you may discover one or two small blemishes on it showing up as bright dots, e.g. one near the lower right-hand edge of this frame. (Author: Gerhard Niklasch)
Magnifying even m
The outer top fac -
Malachite needles on matrix; Tsumeb Mine, Otawi highlands, Namibia.
65x52x40mm, 184g. GN’s collection id 09NAMm001.
Taken in direct sunlight. Close-up stereo pair. (Author: Gerhard Niklasch)
Malachite needles
65x52x40mm, 184g. -
Malachite needles on matrix; Tsumeb Mine, Otawi highlands, Namibia.
65x52x40mm, 184g. GN’s collection id 09NAMm001.
Taken in direct sunlight. Stereo pair. (Author: Gerhard Niklasch)
Malachite needles
65x52x40mm, 184g. -
Malachite needles on matrix; Tsumeb Mine, Otawi highlands, Namibia.
65x52x40mm, 184g. GN’s collection id 09NAMm001.
Taken in direct sunlight. (Author: Gerhard Niklasch)
Malachite needles
65x52x40mm, 184g. -
Malachite psm Cuprite, Chessy-les-Mines, Rhône-Alpes, France.
12 x 10 x 10mm, weight ~1.55g. GN’s collection id 09FRMc001.
Detail: pits with some Malachite needles, stereo pair, halogen light plus white LED. Field of view about 5 x 9.5mm. (Author: Gerhard Niklasch)
Malachite psm Cup
12 x 10 x 10mm, w -
Malachite psm Cuprite, Chessy-les-Mines, Rhône-Alpes, France.
12 x 10 x 10mm, weight ~1.55g. GN’s collection id 09FRMc001.
Stereo pair, halogen light plus white-LED fill-in. (Author: Gerhard Niklasch)
Malachite psm Cup
12 x 10 x 10mm, w -
Malachite psm Cuprite, Chessy-les-Mines, Rhône-Alpes, France.
12 x 10 x 10mm, weight ~1.55g. GN’s collection id 09FRMc001.
Stereo pair, halogen light plus white-LED fill-in. (Author: Gerhard Niklasch)
Malachite psm Cup
12 x 10 x 10mm, w -
Malachite psm Cuprite, Chessy-les-Mines, Rhône-Alpes, France.
12 x 10 x 10mm, weight ~1.55g. GN’s collection id 09FRMc001.
Taken through stereo microscope (eyepiece projection), halogen light plus white-LED fill-in. (Author: Gerhard Niklasch)
Malachite psm Cup
12 x 10 x 10mm, w -
Oblique view, crossed-eye stereo pair (Author: Gerhard Niklasch)
Oblique view, crossed-eye stereo p
-
Octahedral Pyrite; Huanzala Mine, Huallanca dist., Huanaco, Peru.
Specimen dimensions 60 x 38 x 24mm, xx to 31mm (edge), weight 98g. GN’s collection id 09PEP-001.
Stereo pair, taken in direct sunlight. (Author: Gerhard Niklasch)
Octahedral Pyrite
Specimen dimensio -
Octahedral Pyrite; Huanzala Mine, Huallanca dist., Huanaco, Peru.
Specimen dimensions 60 x 38 x 24mm, xx to 31mm (edge), weight 98g. GN’s collection id 09PEP-001.
Stereo pair, taken in direct sunlight. (Author: Gerhard Niklasch)
Octahedral Pyrite
Specimen dimensio -
Octahedral Pyrite; Huanzala Mine, Huallanca dist., Huanaco, Peru.
Specimen dimensions 60 x 38 x 24mm, xx to 31mm (edge), weight 98g. GN’s collection id 09PEP-001.
Taken in direct sunlight. (Author: Gerhard Niklasch)
Octahedral Pyrite
Specimen dimensio -
Octahedral Pyrite; Huanzala Mine, Huallanca dist., Huanaco, Peru.
Specimen dimensions 60 x 38 x 24mm, xx to 31mm (edge), weight 98g. GN’s collection id 09PEP-001.
Taken in direct sunlight. (Author: Gerhard Niklasch)
Octahedral Pyrite
Specimen dimensio -
Olivine series, Forsterite var.Peridot with Calcite; Sapat Gali (Soppat), Kohistan, Pakistan.
50x35x33mm, 56g. GN’s collection id 09PKOcm01.
Taken in direct sunlight. Stereo pair. (Author: Gerhard Niklasch)
Olivine series, F
50x35x33mm, 56g. -
Olivine series, Forsterite var.Peridot with Calcite; Sapat Gali (Soppat), Kohistan, Pakistan.
50x35x33mm, 56g. GN’s collection id 09PKOcm01.
Taken in direct sunlight. Stereo pair. (Author: Gerhard Niklasch)
Olivine series, F
50x35x33mm, 56g. -
Olivine series, Forsterite var.Peridot with Calcite; Sapat Gali (Soppat), Kohistan, Pakistan.
50x35x33mm, 56g. GN’s collection id 09PKOcm01.
Taken in direct sunlight. (Author: Gerhard Niklasch)
Olivine series, F
50x35x33mm, 56g. -
Olivine series, Forsterite var.Peridot with Calcite; Sapat Gali (Soppat), Kohistan, Pakistan.
50x35x33mm, 56g. GN’s collection id 09PKOcm01.
Taken in direct sunlight. (Author: Gerhard Niklasch)
Olivine series, F
50x35x33mm, 56g. -
Prehnite and Epidote; Kayes region, Mali.
Diameter 18-20mm, 14g. GN’s collection id 09MLPE001.
Taken in direct sunlight. Stereo pair. (Author: Gerhard Niklasch)
Prehnite and Epid
Diameter 18-20mm, -
Prehnite and Epidote; Kayes region, Mali.
Diameter 18-20mm, 14g. GN’s collection id 09MLPE001.
Taken in direct sunlight. (Author: Gerhard Niklasch)
Prehnite and Epid
Diameter 18-20mm, -
Prehnite and Epidote; Kayes region, Mali.
Diameter 18-20mm, 14g. GN’s collection id 09MLPE001.
Taken in direct sunlight. (Author: Gerhard Niklasch)
Prehnite and Epid
Diameter 18-20mm, -
Pyrite(?) inclusions in zoned Baryte tablet; Cerro Warihuyn, Miraflores, Huanaco, Peru.
Specimen dimensions 40 x 27 x 6mm, weight 24g. GN’s collection id 09PEB-001.
Stereo pair, field of view about 1.6x2.8mm.
Stereo microscope, eyepiece projection; halogen incandescent light with white LED fill-in. (Author: Gerhard Niklasch)
Pyrite(?) inclusi
Specimen dimensio -
Pyrite(?) inclusions in zoned Baryte tablet; Cerro Warihuyn, Miraflores, Huanaco, Peru.
Specimen dimensions 40 x 27 x 6mm, weight 24g. GN’s collection id 09PEB-001.
Stereo pair, field of view about 2.4x4mm.
Stereo microscope, eyepiece projection; halogen incandescent light with white LED fill-in. (Author: Gerhard Niklasch)
Pyrite(?) inclusi
Specimen dimensio -
Pyrite(?) inclusions in zoned Baryte tablet; Cerro Warihuyn, Miraflores, Huanaco, Peru.
Specimen dimensions 40 x 27 x 6mm, weight 24g. GN’s collection id 09PEB-001.
Stereo pair, field of view about 6x11mm.
Stereo microscope, eyepiece projection; halogen incandescent light with white LED fill-in. (Author: Gerhard Niklasch)
Pyrite(?) inclusi
Specimen dimensio -
Pyrite(?) inclusions in, and Limonite after Pyrite(?) on, zoned Baryte tablet; Cerro Warihuyn, Miraflores, Huanaco, Peru.
Specimen dimensions 40 x 27 x 6mm, weight 24g. GN’s collection id 09PEB-001.
Stereo pair, field of view about 2.3x4mm.
Stereo microscope, eyepiece projection; halogen incandescent light with white LED fill-in. (Author: Gerhard Niklasch)
Pyrite(?) inclusi
Specimen dimensio -
Pyrite(?) inclusions in zoned Baryte tablet; Cerro Warihuyn, Miraflores, Huanaco, Peru.
Specimen dimensions 40 x 27 x 6mm, weight 24g. GN’s collection id 09PEB-001.
Stereo pair, field of view about 4x6mm.
Stereo microscope, eyepiece projection; halogen incandescent light with white LED fill-in. (Author: Gerhard Niklasch)
Pyrite(?) inclusi
Specimen dimensio -
Pyrite(?) inclusions in zoned Baryte tablet; Cerro Warihuyn, Miraflores, Huanaco, Peru.
Specimen dimensions 40 x 27 x 6mm, weight 24g. GN’s collection id 09PEB-001.
Field of view about 1.8x2.7mm.
Stereo microscope, eyepiece projection; halogen incandescent light with white LED fill-in. (Author: Gerhard Niklasch)
Pyrite(?) inclusi
Specimen dimensio -
Quartz (var. phantom Amethyst Enhydro); Brandberg district, Namibia.
72x43x~50mm, main quartz to 42mm, 94g. GN’s collection id 09NAQm001.
Taken in direct sunlight. Stereo pair. (Author: Gerhard Niklasch)
Quartz (var. phan
72x43x~50mm, main -
Quartz (var. phantom Amethyst Enhydro); Brandberg district, Namibia.
72x43x~50mm, main quartz to 42mm, 94g. GN’s collection id 09NAQm001.
Taken in direct sunlight. (Author: Gerhard Niklasch)
Quartz (var. phan
72x43x~50mm, main -
Quartz (var. phantom Amethyst Enhydro); Brandberg district, Namibia.
72x43x~50mm, main quartz to 42mm, 94g. GN’s collection id 09NAQm001.
Taken in direct sunlight. (Author: Gerhard Niklasch)
Quartz (var. phan
72x43x~50mm, main -
Same in stereo. The octahedral {111} faces are very small. FOV 9x16.7mm. (Author: Gerhard Niklasch)
Same in stereo. The octahedral {11
-
Side view (Author: Gerhard Niklasch)
Side view
-
Side view (taken through the microscope), faces labelled with their Miller indices. Field of view 15x11.5mm. (Author: Gerhard Niklasch)
Side view (taken through the micro
-
Side view, lit differently, crossed-eye stereo pair (Author: Gerhard Niklasch)
Side view, lit differently, crosse
-
Spinel, Ipanko, Mahenge, Morogoro, Tanzania.
57 x 52 x 52mm, weight 128g. GN’s collection id 09TZS-001.
Same area under SWUV (stereo view), field of view about 11.5x14mm. (Author: Gerhard Niklasch)
Spinel, Ipanko, M
57 x 52 x 52mm, w -
Spinel, Ipanko, Mahenge, Morogoro, Tanzania.
57 x 52 x 52mm, weight 128g. GN’s collection id 09TZS-001.
Detail (stereo view), field of view about 12x14.5mm, stereo microscope, halogen plus white-LED fill-in. (Author: Gerhard Niklasch)
Spinel, Ipanko, M
57 x 52 x 52mm, w -
Spinel, Ipanko, Mahenge, Morogoro, Tanzania.
57 x 52 x 52mm, weight 128g. GN’s collection id 09TZS-001.
Stereo pair, taken in direct sunlight. (Author: Gerhard Niklasch)
Spinel, Ipanko, M
57 x 52 x 52mm, w -
Spinel, Ipanko, Mahenge, Morogoro, Tanzania.
57 x 52 x 52mm, weight 128g. GN’s collection id 09TZS-001.
Stereo pair, taken in diffuse daylight. (Author: Gerhard Niklasch)
Spinel, Ipanko, M
57 x 52 x 52mm, w -
Spinel, Ipanko, Mahenge, Morogoro, Tanzania.
57 x 52 x 52mm, weight 128g. GN’s collection id 09TZS-001.
Taken in sunlight filtering through clouds. (Author: Gerhard Niklasch)
Spinel, Ipanko, M
57 x 52 x 52mm, w -
Spinel, Ipanko, Mahenge, Morogoro, Tanzania.
57 x 52 x 52mm, weight 128g. GN’s collection id 09TZS-001.
Taken in diffuse daylight. (Author: Gerhard Niklasch)
Spinel, Ipanko, M
57 x 52 x 52mm, w -
Stereo view onto the top of the specimen. The interior is very pale green and perfectly transparent. (Note that the cube(001) face is "standing on end" as it were, its edges at 45° to the axes.) (Author: Gerhard Niklasch)
Stereo view onto the top of the sp
-
The shape and orientation of the bright {110} face provide the easiest way to deduce that the surrounding faces are {113}. {112} would give the same diamond shape with angles of 70.5° and 109.5° but oriented the other way, acute corners towards the cube face. {114} and higher forms would cut narrower rhombs out of the {110} face. (Author: Gerhard Niklasch)
The shape and orientation of the b
-
Tourmaline slice, diam.23mm by 3mm thick, collection id 08xxT-001. (Author: Gerhard Niklasch)
Tourmaline slice, diam.23mm by 3mm
-
Tourmaline slice, loc. unknown, detail. GN’s collection id 08xxT-002.
Field of view about 22mm wide. (Author: Gerhard Niklasch)
Tourmaline slice,
Field of view abo -
Tourmaline slice, loc. unknown, detail. GN’s collection id 08xxT-002.
Stereo pair, field of view about 4mm wide. (Author: Gerhard Niklasch)
Tourmaline slice,
Stereo pair, fiel -
Tourmaline slice, loc. unknown, detail. GN’s collection id 08xxT-002.
Stereo pair, field of view about 13mm wide. (Author: Gerhard Niklasch)
Tourmaline slice,
Stereo pair, fiel -
Tourmaline slice, diam.23mm by 3mm thick, collection id 08xxT-001.
Stereo pair, field of view about 18mm wide. (Author: Gerhard Niklasch)
Tourmaline slice,
Stereo pair, fiel -
Tourmaline slice, loc. unknown, diam. 37 to 38.5mm by 2.9mm thick, GN’s collection id 08xxT-002.
Stereo pair. (Author: Gerhard Niklasch)
Tourmaline slice,
Stereo pair. -
Tourmaline slice, loc. unknown, diam. 37 to 38.5mm by 2.9mm thick, GN’s collection id 08xxT-002.
Two views. (Author: Gerhard Niklasch)
Tourmaline slice,
Two views. -
Tourmaline, Erongo Mt., Namibia. Diam. 53mm, height 28mm. GN’s collection id 08NAT-001. (Author: Gerhard Niklasch)
Tourmaline, Erongo Mt., Namibia. D
-
Zoned Baryte tablet; Cerro Warihuyn, Miraflores, Huanaco, Peru.
Specimen dimensions 40 x 27 x 6mm, weight 24g. GN’s collection id 09PEB-001.
Field of view about 13x15mm.
Stereo microscope, eyepiece projection; halogen incandescent (front and back) light. (Author: Gerhard Niklasch)
Zoned Baryte tabl
Specimen dimensio -
Zoned Baryte tablet; Cerro Warihuyn, Miraflores, Huanaco, Peru.
Specimen dimensions 40 x 27 x 6mm, weight 24g. GN’s collection id 09PEB-001.
Stereo pair, field of view about 13x15mm.
Stereo microscope, eyepiece projection; halogen incandescent (front) light. (Author: Gerhard Niklasch)
Zoned Baryte tabl
Specimen dimensio -
Zoned Baryte tablet; Cerro Warihuyn, Miraflores, Huanaco, Peru.
Specimen dimensions 40 x 27 x 6mm, weight 24g. GN’s collection id 09PEB-001.
Stereo pair, taken in direct sunlight. (Author: Gerhard Niklasch)
Zoned Baryte tabl
Specimen dimensio -
Zoned Baryte tablet; Cerro Warihuyn, Miraflores, Huanaco, Peru.
Specimen dimensions 40 x 27 x 6mm, weight 24g. GN’s collection id 09PEB-001.
Taken in direct sunlight. (Author: Gerhard Niklasch)
Zoned Baryte tabl
Specimen dimensio
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