mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 Mohs; Color: White to translucent gray; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 Mohs
- Color
- White to translucent gray
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 Mohs; Color: White to translucent gray; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Forms through the crystallization of silica-rich hydrothermal fluids in veins or as a primary constituent in igneous rocks like granite. It is found in all geological ages.
Uses & applications
Used in glassmaking, electronics (piezoelectric properties), abrasives, construction aggregates, and semi-precious jewelry.
Geological facts
Milkiness is caused by tiny inclusions of gas or liquid trapped during crystal growth. It is the most common variety of crystalline quartz.
Field identification & locations
Identify by its hardness (scratches glass), waxy/glassy appearance, and lack of cleavage planes. Found globally in mountainous regions, riverbeds, and beach deposits.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
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Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
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Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
mineral
Epidote
Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)
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