mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: White/Opaque, Luster: Vitreous to greasy, Crystal structure: Hexagonal/Trigonal, Specific gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White/Opaque, Luster: Vitreous to greasy, Crystal structure: Hexagonal/Trigonal, Specific gravity: 2.65
Formation & geological history
Found in igneous, metamorphic, and sedimentary rocks. Forms through hydrothermal processes, crystallization from magma, or precipitation from fluids. Common in many geological ages.
Uses & applications
Used in glass manufacturing, electronics (piezoelectric properties), abrasives, watches, and as a common collector's mineral.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz gets its white appearance from microscopic fluid inclusions trapped during growth.
Field identification & locations
Identified by its ability to scratch glass, lack of cleavage (conchoidal fracture), and white color. Found globally in veins and riverbeds.
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Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Schist
Schist
Metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic