mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: White or cloudy, Luster: Vitreous to greasy, Crystal structure: Trigonal/Hexagonal, Cleavage: Indistinct/Conchoidal fracture, Specific gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White or cloudy, Luster: Vitreous to greasy, Crystal structure: Trigonal/Hexagonal, Cleavage: Indistinct/Conchoidal fracture, Specific gravity: 2.65
Formation & geological history
Formed through the crystallization of silica-rich hydrothermal solutions or within igneous pegmatites. The milky appearance is caused by tiny inclusions of liquid or gas trapped during crystal growth.
Uses & applications
Used as an abrasive in industry, in the production of glass and ceramics, as a source for silicon, and in landscaping or as low-cost decorative specimens.
Geological facts
Milky quartz is the most common variety of crystalline quartz. It can sometimes contain trace amounts of gold within veins, making it a target for prospectors.
Field identification & locations
Identify in the field by its white color, hardness (it will scratch glass), and lack of cleavage (it breaks in irregular, shell-like curves). Commonly found in mountain regions and riverbeds globally.
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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