mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: White to tan/light brown due to impurities, Luster: Vitreous to greasy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (Conchoidal fracture), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White to tan/light brown due to impurities, Luster: Vitreous to greasy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (Conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Formed through hydrothermal processes in veins, or through the cooling of silica-rich magma in igneous rocks like granite. Often found in pegmatites and metamorphic environments.
Uses & applications
Used in glassmaking, as an abrasive, in the electronics industry for its piezoelectric properties, and as a decorative stone in landscaping or jewelry.
Geological facts
Milky quartz gets its cloudy appearance from microscopic inclusions of fluids trapped during crystal growth. It is one of the most common minerals in the Earth's crust.
Field identification & locations
Identify by its hardness (scratches glass), lack of cleavage, and common occurrence in veins. Found globally in mountainous regions and riverbeds.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
![Green Apatite on Albite (Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]) — mineral](https://media.rockidentification.com/2391a63f-fb20-47d5-af9a-2035851eb32e-thumbnail.jpg)
Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
mineral