mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: Translucent white to milky white, 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: Translucent white to milky white, Luster: Vitreous to greasy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Formed through the molten crystallization of magma or by precipitation from hydrothermal veins. The milky appearance is caused by tiny inclusions of gas and/or liquid trapped during crystal growth.
Uses & applications
Used in decorative landscaping, glass manufacturing, quartz oscillators for electronics, and as a popular semi-precious stone for beginner collectors and jewelry tumbled stones.
Geological facts
Milky quartz is the most common variety of crystalline quartz. Historically, it was used by many ancient cultures for stone tools and ritual objects due to its abundance and hardness.
Field identification & locations
Identify in the field by its waxy luster and ability to scratch glass. It is commonly found in riverbeds, mountain ranges, and within quartz veins of metamorphic and igneous rocks globally.
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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