mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: White to translucent gray, Luster: Vitreous to greasy, Crystal Structure: Hexagonal (Trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White to translucent gray, Luster: Vitreous to greasy, Crystal Structure: Hexagonal (Trigonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Formed in hydrothermal veins and pegmatites through the cooling of silica-rich fluids. This specific cobble appears water-worn, indicating it was transported by a river or stream.
Uses & applications
Used in glassmaking, abrasives, electronics (piezoelectric properties), and as a common decorative landscape stone.
Geological facts
Milky quartz gets its cloudy appearance from tiny fluid or gas inclusions trapped during crystal growth. It is one of the most common minerals on Earth's crust.
Field identification & locations
Identify in the field by its hardness (scratches glass), lack of cleavage, and white 'milky' appearance. It is found globally in almost all geological environments.
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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