mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: White/Opaque, Luster: Vitreous to Greasy, Crystal Structure: Trigonal/Hexagonal, Cleavage: Indistinct/Conchoidal Fracture, Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White/Opaque, Luster: Vitreous to Greasy, Crystal Structure: Trigonal/Hexagonal, Cleavage: Indistinct/Conchoidal Fracture, Specific Gravity: 2.65
Formation & geological history
Formed during the final stages of hydrothermal crystallization in igneous veins or metamorphic environments. The milky appearance is caused by tiny fluid inclusions of gas and/or liquid trapped during crystal growth.
Uses & applications
Used in glass manufacturing, electronics (piezoelectric properties), abrasives, as a flux in metallurgy, and widely used in landscaping and as a decorative collector stone.
Geological facts
Milky quartz is the most common variety of crystalline quartz. While it lacks the transparency of rock crystal, the millions of microscopic bubbles trapped inside hold a geological record of the fluids present during its formation.
Field identification & locations
Identify by its white opaque color, lack of cleavage (breaks like glass), and its ability to scratch glass. Commonly found in river beds, beaches, and mountain outcrops globally.
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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
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock