mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- White to translucent
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Forms in hydrothermal veins or as a late-stage crystallization in igneous rocks. The milky color is caused by microscopic inclusions of gas or liquid trapped during crystal growth.
Uses & applications
Used in glass making, abrasive materials, electronics as a frequency control, and as a decorative stone in landscaping or jewelry.
Geological facts
Quartz is one of the most abundant minerals on Earth. It is piezoelectric, meaning it can generate an electric charge when mechanical stress is applied.
Field identification & locations
Identify in the field by its hardness (will scratch glass), lack of cleavage, and white clouded appearance. Commonly found in mountainous regions or as river-worn pebbles.
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Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
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Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)
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