mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Milky white to tan with some iron staining; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Milky white to tan with some iron staining
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Milky white to tan with some iron staining; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Forms in a wide variety of environments, most commonly from hydrothermal veins or cooling igneous magma. This specimen appears water-worn or weathered, likely found in a riverbed or secondary deposit.
Uses & applications
Used in glassmaking, abrasives, electronics (piezoelectric properties), and as decorative gravel or gemstones.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Its milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.
Field identification & locations
Identify by its hardness (it will easily scratch glass) and lack of cleavage planes. Found globally in almost all geological environments.
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Mineral/Rock
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Green Apatite on Albite
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mineral