mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: White to milky translucent, Luster: Vitreous to greasy, Crystal Structure: Hexagonal (trigonal), Cleavage: None (conchoidal fracture), SG: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White to milky translucent, Luster: Vitreous to greasy, Crystal Structure: Hexagonal (trigonal), Cleavage: None (conchoidal fracture), SG: 2.65
Formation & geological history
Formed in hydrothermal veins and pegmatites when silicon-enriched fluids cool deep within the earth's crust. It is common in igneous, metamorphic, and sedimentary environments.
Uses & applications
Used in glassmaking, abrasives, semiconductor manufacturing, watch oscillators, and as a decorative stone in landscaping or jewelry.
Geological facts
The milky appearance is caused by minute fluid inclusions of gas or liquid trapped during the crystal's growth. It is one of the most abundant minerals on Earth.
Field identification & locations
Identify by its ability to scratch glass, its milky white color, and the lack of cleavage (it breaks in irregular, curved shards). Found globally in mountainous regions and riverbeds.
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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