mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: translucent white to opaque white, 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: translucent white to opaque white, Luster: vitreous to greasy, Crystal structure: Hexagonal/Trigonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Formed from hydrothermal solutions or within igneous pegmatites as cooling magma releases silica-rich fluids. It can be found in a wide variety of geological ages and environments.
Uses & applications
Used in glassmaking, abrasives, electronics (piezoelectric properties), jewelry (cabochons), and as landscaping stone.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. The 'milky' appearance is caused by tiny liquid or gas inclusions trapped during crystal growth.
Field identification & locations
Identify by its hardness (scratches glass), lack of cleavage, and characteristic milky appearance. Found globally, especially in mountain ranges 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