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Analcime
Knife River, St. Louis County, Minnesota, USA
The specimen is about 7.5 X 8 X 6 cm.
Field of view is about 3.5 cm (Author: John Nash)
Analcime
Knife River, St.
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Analcime
Knife River, St. Louis County, Minnesota, USA
The specimen is about 7.5 X 8 X 6 cm.
The analcite crystals are quite small, only about 2mm. See the close-up. (Author: John Nash)
Analcime
Knife River, St.
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Apophyllite
Castle Danger, Minnesota, USA
The apophyllites are about 2 cm
These are part of a large (40 cm) rock (coarsely crystallized gabbro) found last weekend on the coast of Lake Superior that split perfectly down the middle revealing a number of pockets. Now for some extensive work with the rock trimmer to turn these into specimens. (Author: John Nash)
Apophyllite
Castle Danger, Minneso
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Apophyllite on calcite
Onion River, near Lutsen, Cook County, Minnesota, USA
6.5 X 4 X 4 cm
A fine calcite crystal with a number of clear apophyllites on it. (Author: John Nash)
Apophyllite on ca
Onion River, near
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Apophyllite on calcite
Onion River, near Lutsen, Cook County, Minnesota, USA
3.5 X 3 X 3 cm
A stubby little calcite crystal with many clear apophyllites growing on the top. (Author: John Nash)
Apophyllite on ca
Onion River, near
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Apophyllite
Onion River, near Lutsen, Cook County, Minnesota, USA
Field of view 3 cm
A close up of the apophyllite showing the clarity. (Author: John Nash)
Apophyllite
Onion River, near
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Barite
Linwood Mine, Buffalo, Iowa, USA
12.5 cm X 7 cm, 4.5 cm thick. (Author: John Nash)
Barite
Linwood Mine, Buffalo, Iowa
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Barite on limestone
Linwood Mine, Buffalo, Iowa, USA
The specimen is about 11 X 6.5 X 2.5 cm
The largest crystal is 8 cm long, 2 cm thick and doubly terminated, as are most of the smaller crystals. There are crystals on both sides of the limestone. (Author: John Nash)
Barite on limestone
Linwood Mine,
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Calcite
Elmwood, Tennessee, USA
16.5 cm
A great, gemmy calcite, perfect color. (Author: John Nash)
Calcite
Elmwood, Tennessee, USA
16
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Calcite
Elmwood, Tennessee, USA
overall size 33.5 X 22 cm
A 15 cm calcite and several smaller golden calcites actually glue two pieces of limestone together. (Author: John Nash)
Calcite
Elmwood, Tennessee, USA
ov
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Calcite
Gallatin Canyon, Montana
7.5 cm
This is the largest of several calcites on this 17.5 cm specimen (Author: John Nash)
Calcite
Gallatin Canyon, Montana
7
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Calcite
Gallatin Canyon, Montana, USA
17 X 10 X 6 cm
This is a fine, classic Gallatin Canyon calcite specimen. It is nearly a floater, I can find only two 1-cm points of attachment from what must have been a large pocket with branching, lobular matrices in it, covered with tiny calcites. On top of those grew the large golden scalenohedrons. The largest calcite is 7.5 cm (3 inches) and is doubly terminated. All the large scalenohedrons are undamaged. The overall size of this grand specimen is 17 X 10 X 6 cm. The specimen was passed from Ronald L. Anderson of Littleton, CO to the Buckskin Booksellers of Ouray, CO. I purchased in from Robert Stouffer, also of Ouray, CO. (Author: John Nash)
Calcite
Gallatin Canyon, Montana,
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Calcite
Onion River, Cook County, Minnesota, US
6 X 4 cm
Another close up. (Author: John Nash)
Calcite
Onion River, Cook County,
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Calcite
Onion River, Cook County, Minnesota, US
6 X 4 cm
A close up. (Author: John Nash)
Calcite
Onion River, Cook County,
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Calcite
Onion River, Cook County, Minnesota, US
6 X ~4cm
A scalenohedron with an unusual termination. (Author: John Nash)
Calcite
Onion River, Cook County,
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Calcite and laumontite
Onion River, near Lutsen, Cook County, Minnesota, USA
3 X 1.5 cm
From the same pocket as the apophyllite. (Author: John Nash)
Calcite and laumo
Onion River, near
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Calcite in laumontite
Near Beaver Bay, Lake County, Minnesota, USA
Largest crystal is 6 cm (Author: John Nash)
Calcite in laumon
Near Beaver Bay,
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Calcite in laumontite
Near Beaver Bay, Lake County, Minnesota, USA
25 X 18 X 16 cm
Ex-Roland Quinn, proprietor of the Beaver Bay Agate Shop at the time. Roland inherited the shop and collection from his father. This incredible specimen has a group of flat-topped pseudohexagonal calcites in a large boulder of calcite and laumontite. It clearly was a piece of a large calcite vein that broke off. The miracle is that the whole specimen looks like a water-worn rock, but the calcite crystals are pristine and undamaged, showing no signs of wear at all. Greg theorizes this must have been in a part of Lake Superior with a sandy bottom. The usual pebble bottoms would have made short work of the calcite. The largest crystal is about 6 cm across. A true Minnesota classic, rare beyond rare. (Author: John Nash)
Calcite in laumon
Near Beaver Bay,
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Calcite on calcite
Shullsburg-Hazel Green area, Upper Mississippi Valley District, Lafayette Co., Wisconsin, USA
8 cm tall as pictured (Author: John Nash)
Calcite on calcite
Shullsburg-Haze
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Calcite with apophyllite
Onion River, near Lutsen, Cook County, Minnesota, USA
9 X 7 X 6 cm
Two calcites, entwined like lovers, with a few apophyllites. (Author: John Nash)
Calcite with apop
Onion River, near
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Calcite with pyrite inclusions
Linwood Mine, Buffalo, Iowa, USA
12.5 X 8 X 6 cm.
Incredible clear calcite crystals with tiny, sparkling pyrite crystals inside. Truly remarkable. (Author: John Nash)
Calcite with pyrite inclusions
Lin
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Calcite, Apophyllite
Onion River roadcut, Lutsen Township, Cook County, Minnesota
9 X 7 X 6 cm (approximately)
Another view of these lovely entwined crystals. (Author: John Nash)
Calcite, Apophyll
Onion River roadc
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Calcite, apophyllite
Onion River roadcut, Lutsen Township, Cook County, Minnesota
9 X 7 X 6 cm (approximately)
Two large calcites sort of wrapped around each other, both with a few apophyllites gracing them. A surprising gift from the lavas of Minnesota’s North Shore (Author: John Nash)
Calcite, apophyll
Onion River roadc
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Calcite, apophyllite
Onion River roadcut, Lutsen Township, Cook County, Minnesota
3.5 X 3 X 3 cm
Close-up of apophyllite on calcite, apos are about 4 - 5 mm (Author: John Nash)
Calcite, apophyll
Onion River roadc
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Calcite, Apophyllite
Onion River roadcut, Lutsen Township, Cook County, Minnesota,
3.5 X 3 X 3 cm
Apophyllite on calcite showing clear to white apophyllite faces. (Author: John Nash)
Calcite, Apophyll
Onion River roadc
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Calcite
Near Crystal Creek, Minnesota, USA
15 X 10 X 8 cm
A group of scalenohedral calcites, the largest is 4 cm, sitting in a vug of greenish quartz. Found by my son Greg in a rock slide at a road cut through the North Shore basalt. (Author: John Nash)
Calcite
Near Crystal Cree
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Copper, minor chrysocolla
Knife River, St. Louis County, Minnesota, USA
Specimen 12 X 9 X 6 cm
Field of view is about 4 cm, the main rough crystal is 2.5 cm and protrudes up out of the matrix. (Author: John Nash)
Copper, minor chr
Knife River, St.
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Kinoite in calcite
Knife River, St. Louis County, Minnesota, USA
Specimen 7 X 6 X 5 cm, Field of view 2 cm
A one time find of kinoite in calcite. (Author: John Nash)
Kinoite in calcit
Knife River, St.
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Natrolite
Knife River, St. Louis County, Minnesota, USA
9 X 6 X 3.5 cm
A 4.5 cm pocket filled with natrolite or a closely related species. (Author: John Nash)
Natrolite
Knife River, St.
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Pectolite and apophyllite
Castle Danger, Minnesota, USA
The pectolite spray is 2 cm across (Author: John Nash)
Pectolite and apophyllite
Castle D
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Pectolite
Castle Danger, the Rock Yard, Minnesota, USA
About 5 X 9 X 9 cm
Radiating clusters of Pectolite crystals and another mineral, possibly xonotlite, in a dark green mix of augite and plagioclase altered to prehnite. About 5 X 9 X 9 cm, the specimen is an amygdule containing the pectolite, surrounded by prehnite. This was described in a 1924 article by G. M. Schwartz of the U of MN in the American Mineralogist, pp. 83 - 88. (Author: John Nash)
Pectolite
Castle Danger, th
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Prehnite epimorphs of laumontite
Knife River, St. Louis County, Minnesota, USA
6 X 5 X 4 cm
Beautiful orange prehnite epimorphs of laumontite. (Author: John Nash)
Prehnite epimorph
Knife River, St.
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Prehnite epipmorphs of laumontite
Knife River, St. Louis County, Minnesota, USA
5 cm field of view (Author: John Nash)
Prehnite epipmorp
Knife River, St.
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Prehnite, minor copper
Knife River, St. Louis County, Minnesota, USA
8 X 6 X 5 cm
Gemmy light green prehnite, some copper inside. (Author: John Nash)
Prehnite, minor c
Knife River, St.
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Prehnite
Knife River, St. Louis County, Minnesota, USA
Field of view about 6 cm
The light blue iridescence on this orange prehnite is stunning. (Author: John Nash)
Prehnite
Knife River, St.
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Prehnite
Knife River, St. Louis County, Minnesota, USA
9 X 7 X 4
Orange iridescent prehnite. So lovely in person, look at the close-up! Another one-time find, one boulder from the river, discovered by my son Greg. (Author: John Nash)
Prehnite
Knife River, St.
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Prehnite
Knife River, St. Louis County, Minnesota, USA
Field of view 2.5 cm
Most remarkable iridescent orange prehnite, metallic blue and purple flashes are amazing in person. I’ve found only a few examples in 5 years of visiting the locale. (Author: John Nash)
Prehnite
Knife River, St.
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Prehnite
Knife River, St. Louis County, Minnesota, USA
Field of view 4.5 cm (Author: John Nash)
Prehnite
Knife River, St.
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Prehnite
Knife River, St. Louis County, Minnesota, USA
Field of view 11 cm (Author: John Nash)
Prehnite
Knife River, St.
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Prehnite
Knife River, St. Louis County, Minnesota, USA
19.5 X 10 X 10 cm approximately
This orange prehnite shows partial casts after laumontite, the largest cast is about 2 cm. The prehnite glitters with gold and some blue iridescence. (Author: John Nash)
Prehnite
Knife River, St.