mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Clear to white/translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Clear to white/translucent
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Clear to white/translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
Formation & geological history
Formed from hydrothermal solutions or the cooling of magma rich in silica. Often found in veins or cavities within various rock types, including geodes.
Uses & applications
Used in electronics, watches (oscillators), manufacturing of glass, gemstones for jewelry, and as educational/specimen collections.
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust. Its name comes from the German word 'Quarz' which is of Slavic origin.
Field identification & locations
Identify in the field by its hardness (it scratches glass), lack of cleavage, and vitreous luster. Commonly found in mountainous regions, riverbeds, and as a component of granite and sandstone.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
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Schist
Metamorphic
Epidote
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metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
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Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock