Quartz crystal mineral (SiO2) Cristal de Quartzo

Brazilian Quartz crystal, kwarc kryształ in Florianópolis, Santa Catarina, Brasil

Category: Silicate mineral
Formula: SiO2
Crystal system: Hexagonal
Mohs scale hardness: 7
Density: 2.65; variable 2.59--2.63 in impure varieties
Sign: Áll

Quartz is the second most abundant mineral in the Earth's continental crust, after feldspar.

Pure quartz, traditionally called rock crystal (sometimes called clear quartz), is colorless and transparent (clear) or translucent, and has often been used for hardstone carvings, such as the Lothair Crystal. Common colored varieties include citrine, rose quartz, amethyst, smoky quartz, milky quartz, and others.

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