mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs), Color: Milky white to cloudy, 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), Color: Milky white to cloudy, Luster: Vitreous to greasy, Crystal structure: Hexagonal (Trigonal), Cleavage: None/Conchoidal fracture, Specific gravity: 2.65
Formation & geological history
Forms in hydrothermal veins or as a major constituent in igneous and metamorphic rocks. The cloudy appearance is caused by tiny liquid or gas bubble inclusions trapped during crystal growth.
Uses & applications
Used in glass manufacturing, electronics (due to piezoelectric properties), construction aggregates, as a gemstone in tumbled form, and for decorative landscaping.
Geological facts
Milky quartz is one of the most common varieties of crystalline quartz on Earth. Its white color is specifically due to microscopic inclusions of water or gas being trapped inside the structure millions of years ago.
Field identification & locations
Identify in the field by its hardness (will scratch glass), lack of cleavage, and common occurrence as vein filler. It is ubiquitous in mountainous regions and riverbeds worldwide.
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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
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
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Nephrite
Mineral/Rock