mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 Mohs; Color: Cloudy white to opaque; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
- Hardness
- 7 Mohs
- Color
- Cloudy white to opaque
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 Mohs; Color: Cloudy white to opaque; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
Formation & geological history
Formed from hydrothermal solutions or the cooling of silica-rich magma; commonly found in veins or as a major constituent of igneous rocks like granite.
Uses & applications
Used in glassmaking, electronics, silicon chips, and as an ornamental gemstone or healing crystal in the metaphysical community.
Geological facts
The milky appearance is caused by tiny inclusions of gas or liquid trapped during the crystal's growth. It is one of the most common minerals found on Earth's crust.
Field identification & locations
Identify in the field by its hardness (scratches glass), lack of cleavage, and white waxy appearance. Commonly found in gravel beds, mountain ranges, and near volcanic sites.
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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