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Quartz
- Translations : Quarz, Kvarc, ควอตซ์, Kremeň, Кварц, Kremeň, Cuarzo, Quarzo, Kuvars, Кварц, 水晶, 石英, Thạch anh, 석영, Kvarcas, Křemen, Kvarts, Kwarts, Χαλαζίας,
- Etymology : De l’allemand Quarz.
- Discovery: 1529 by Agricola
Gemological data
- Chemical formula : SiO2
- Hardness (Mohs) : 7
- Density : 2.65
- Refractive index : 1,5442 - 1.5533
- Birefingence : 0.0091
- Crystal system : Trigonal
- Group : Tectosilicates
