Long spiky crystals, transparent in color.
Price: € 200,--
Found: Diamantina Brasil
Weight: 432 Gr.
Size; 9,8 x 9,5 cm
Provenance: Coll. Belo Horizonte 1980, ex. coll. University Amsterdam
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Rock Crystal (Quartz) is a mineral with a hardness of 7 out of 10 on the Mohs scale of mineral hardness [?]. These Trigonally structured gems are made of silicon dioxide, their full chemical compound being SiO2.
Rock Crystal is the purest water-clear and colorless from of Quartz. It is known as mountain crystal (Bergkristall). It is the presence of impurities that gives other varieties of quartz their colors.