mineral
Milky Quartz
Silicon Dioxide (SiO2)
Mohs hardness of 7, white to off-white opaque color, vitreous luster, hexagonal (trigonal) crystal system, conchoidal fracture, specific gravity of 2.65.
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Physical properties
Mohs hardness of 7, white to off-white opaque color, vitreous luster, hexagonal (trigonal) crystal system, conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Formed via hydrothermal activity where mineral-rich water cools in rock fissures, or as part of igneous pegmatites. The white color is caused by tiny liquid or gas inclusions trapped during crystallization.
Uses & applications
Used in glass making, ceramics, and abrasives. Also common in landscaping, as a gemstone (cabochons), and for electronic oscillators in quartz clocks.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz specifically is known for its opacity, which distinguishes it from clear rock crystal.
Field identification & locations
Identify by its hardness (it can scratch glass), its white 'milky' appearance, and lack of cleavage. It is commonly found in riverbeds, mountains, and beaches worldwide.
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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