mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Hardness: 7 (Mohs), Color: Cloudy white to translucent, Luster: Vitreous/glassy to waxy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs), Color: Cloudy white to translucent, Luster: Vitreous/glassy to waxy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Forms from the cooling of silica-rich hydrothermal solutions or magma in veins and pegmatites. It is found in all geological ages and environments.
Uses & applications
Used in glass manufacturing, electronics (due to piezoelectric properties), construction aggregates, and as decorative gravel or gemstone cabochons.
Geological facts
Milky quartz gets its cloudy appearance from microscopic inclusions of liquid or gas trapped during the crystal's growth. It is one of the most common minerals on Earth's crust.
Field identification & locations
Identify by its hardness (scratches glass), white color, and lack of cleavage. Often found in quartz veins or as weathered pebbles in riverbeds and soil.
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Schist
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Epidote
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Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
![Biotite Schist (Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]) — metamorphic](https://media.rock.id/9ca564b5-bc87-402b-965a-69b21f9aa6bf-thumbnail.jpg)
Biotite Schist
Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]
metamorphic