mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: White to opaque; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- White to opaque
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: White to opaque; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.
Formation & geological history
Forms in hydrothermal veins, pegmatites, and as a primary constituent in igneous rocks like granite. Often found in environments where hot silica-rich solutions cool and crystallize over long periods.
Uses & applications
Used in landscaping, glassmaking, electronics (piezoelectric properties), and as a gemstone or collector's specimen.
Geological facts
The cloudy white color is caused by microscopic inclusions of fluids or gas trapped during the crystal's formation. It is one of the most common minerals on Earth's crust.
Field identification & locations
Identify by its hardness (will scratch glass), white color, and lack of cleavage planes. Found globally in mountainous regions and riverbeds.
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Mineral/Rock
Banded Gneiss (River Rock/Pebble)
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Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
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Epidote
Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)
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