mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: White or milky due to microscopic fluid inclusions, Luster: Vitreous to waxy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None/Conchoidal fracture, Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White or milky due to microscopic fluid inclusions, Luster: Vitreous to waxy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None/Conchoidal fracture, Specific Gravity: 2.65
Formation & geological history
Formed in hydrothermal veins and pegmatites through the cooling of silica-rich fluids. It is found in a wide variety of geological environments ranging from igneous to metamorphic terrains.
Uses & applications
Used in glassmaking, ceramics, as an abrasive, and frequently tumbled for use in jewelry or as decorative stones/collectible crystals.
Geological facts
Milky quartz is the most common variety of crystalline quartz. The white color is caused by millions of tiny air or liquid bubbles trapped during the crystal's formation.
Field identification & locations
Identify by its hardness (scratches glass), waxy luster, and lack of cleavage. It is found globally and is particularly abundant in mountain ranges and riverbeds.
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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