mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: White to cloudy; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- White to cloudy
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: White to cloudy; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Formed in hydrothermal veins, pegmatites, and as a primary constituent in igneous rocks like granite. The milky appearance is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth.
Uses & applications
Used in glass making, silicon production, abrasives, and as a decorative stone in landscaping or jewelry. Historically used for making tools due to its hardness.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety and can be found almost everywhere on Earth.
Field identification & locations
Identify in the field by its white color, lack of cleavage, and ability to scratch glass. It is often found as veins in other rock types or as rounded pebbles in stream beds.
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Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
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