Did you mean: Crystal In Rock
rock crystal, transparent variety of the silica mineral quartz that is valued for its clarity and total lack of colour or flaws. Vessels and spheres have been carved from large crystals since ancient times, and the application of the word crystal to fine glassware derives from this practice.
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ROCK CRYSTAL STONE CHARACTERISTICS · Group: Quartz · Chemical composition: Silicon dioxide, SiO² · Hardness: 7 · Crystal System: Rhombehedral · Deposits: Found ...
Missing: Cristal | Show results with:Cristal
Colorless quartz is called rock crystal quartz. The word “crystal” comes from the Greek krustallos which means “ice crystal,” because they thought quartz ...
Missing: Cristal | Show results with:Cristal