mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); 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: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Formed through the crystallization of silica-rich hydrothermal solutions in veins or during the cooling of igneous pegmatites. It is found in all geological ages.
Uses & applications
Used in glass manufacturing, as an abrasive, in electronics for its piezoelectric properties, and as a decorative stone in landscaping or jewelry.
Geological facts
The milky white color is caused by tiny fluid inclusions of gas or liquid trapped during the crystal's growth. It is the most common variety of crystalline quartz.
Field identification & locations
Identify in the field by its hardness (scratches glass), white color, and lack of cleavage. Commonly found in mountain ranges and riverbeds globally.
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Arenite (SiO2 based)
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Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
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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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