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Rock crystal

Rock crystal Rock crystal
Rock crystal Rock crystal

The Rock crystal belongs to a very big group of minerals, which are called quartz. The chemical formula of rock crystal is SiO2. The rock crystal is transparent, that means that he is very clean. Rock crystal has got a hardness of 7. Rock crystals has got beautiful, huge crystals. Single crystals can be several meters long. In Brazil (Rio Grande do Sol), in the USA (Arkansas) and in Switzerland we can find rock crystals. Rock crystal has got a great historical meaning. In the Stone Age people made tools of rock crystal. Until today people make utensils of rock crystals like vases, but also sculptures and jewels. In Greek the word "krystallos" means ice. In former times in Greece people thought that rock crystals consists of ice which cannot melt. Because quartz is a bad conductor of heat rich patrician in former times in Rome had got globes of rock crystal to cool their hands. In former times people thought that rock crystal has got positive effects.

Data about the Rock crystal
Chemical formula SiO2
Mineral class oxides
Crystal system trigonal
Hardness 7
Density 2.65 g/cm3
Color colorless
Line color white
Gloss glass gloss
Break shell
Fissileness none

Author and Webmaster: Lukas Czarnecki

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Last Update: 29.03.2005