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Quartz (Japan Law twin)
specimen is 6.5 cm, largest quartz crystals are 2.5 cm
(Autor: Bob Harman)

Wegner Quartz Crystal Mines, Mount Ida, Montgomery County, Arkansas, USA
Quartz (Japan Law twin)
specimen is 6.5 cm, largest quartz crystals are 2.5 cm
(Autor: Bob Harman)

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