mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 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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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous