mineral
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
Hardness: 7 on Mohs scale; Color: Colorless/Transparent; Luster: Vitreous (glass-like); Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Colorless/Transparent
- Luster
- Vitreous (glass-like)
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Physical properties
Hardness: 7 on Mohs scale; Color: Colorless/Transparent; Luster: Vitreous (glass-like); Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Formed through the cooling of molten rock or by precipitation from hydrothermal veins. It can be found in igneous, metamorphic, and sedimentary environments across all geological ages.
Uses & applications
Extensively used in electronics (oscillators), glassmaking, abrasives, jewelry (as 'rock crystal'), and healing/spiritual collections.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Famous specimens include the 'Bernier Quartz' and various mega-crystals found in Brazil and Arkansas.
Field identification & locations
Identify by its point (if intact), its ability to scratch glass (hardness 7), and its lack of cleavage. Common in many mountain ranges and riverbeds globally; Brazil and the USA (Arkansas) are premier localities.
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metamorphic
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Mineral
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Mineral/Rock
Banded Gneiss (River Rock/Pebble)
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