mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale); Color: Clear to white; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- Clear to white
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 (Mohs scale); Color: Clear to white; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
Formation & geological history
Formed from silica-rich hydrothermal solutions cooling in rock cavities, fractures, or as geodes. Can be found in igneous, metamorphic, and sedimentary environments across all geological ages.
Uses & applications
Used in glassmaking, abrasives, jewelry (druzy settings), electronics (piezoelectric properties), and as collector specimens.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Druzy refers to the coating of tiny crystals that form over another mineral's surface, creating a glittery effect.
Field identification & locations
Identify by its hardness (scratches glass), lack of cleavage, and crystal habit. Common globally, notably in Brazil, Arkansas (USA), and Madagascar.
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Mineral/Rock
Banded Gneiss (River Rock/Pebble)
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Metamorphic Rock
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Biotite Schist
Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]
metamorphic
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Green Apatite on Albite
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mineral