mineral
Milky Quartz
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 (Mohs scale), Color: Opaque white to light gray, Luster: Vitreous to greasy, Crystal structure: Trigonal/Hexagonal, Cleavage: None (Conchoidal fracture), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: Opaque white to light gray, Luster: Vitreous to greasy, Crystal structure: Trigonal/Hexagonal, Cleavage: None (Conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Formed in hydrothermal veins and pegmatites through the cooling of silica-rich fluids. It is found in igneous, metamorphic, and sedimentary environments worldwide across many geological ages.
Uses & applications
Used in glass making, as an abrasive, in electronics (though synthetic is preferred), for construction aggregate, and as a decorative stone in landscaping or jewelry.
Geological facts
The milky appearance is caused by tiny 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. It is extremely common in gravel beds and mountain outcrops.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Calcite–fluorite mineral specimen with iron-oxide staining
Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides
mineral