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.
More like this
Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Granite
Granite (Phaneritic intrusive igneous rock)
igneous