mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: White to translucent with yellowish iron staining, Luster: Vitreous to greasy, Crystal Structure: Trigonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White to translucent with yellowish iron staining, Luster: Vitreous to greasy, Crystal Structure: Trigonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Formed from silica-rich hydrothermal fluids cooling in veins or from metamorphic and igneous processes. This specimen likely came from a quartz vein in a metamorphic or igneous host rock environment.
Uses & applications
Used in glass manufacturing, electronics (due to piezoelectricity), as an abrasive, and for landscaping or decorative stone in gardening.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust. Its cloudy 'milky' appearance is caused by tiny inclusions of gas or liquid trapped during the crystal's growth.
Field identification & locations
Identify by its hardness (scratches glass), lack of cleavage, and translucent appearance. Frequently found in creek beds or mountain trails as durable weathering remnants.
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Arenite (SiO2 based)
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Schist
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Epidote
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Gypsum (variety Selenite or Alabaster)
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Mineral
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Mineral/Rock