mineral
Milky Quartz with Chlorite/Amphibite Inclusions
Silicon Dioxide (SiO2) with various mineral inclusions
Hardness: 7 (Mohs scale), Color: White to milky white with dark green/grey streaks, 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 milky white with dark green/grey streaks, Luster: Vitreous to greasy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Hydrothermal formation in veins or pegmatites. Formed when silica-rich fluids cool and crystallize in rock fractures, often trapping surrounding minerals like chlorite or hornblende during growth.
Uses & applications
Used in glass manufacturing, electronics (as a source of silicon), abrasives, and as decorative garden stone or lapidary material.
Geological facts
Milky quartz owes its white color to millions of microscopic fluid inclusions trapped during the crystal's growth. It is the most common variety of crystalline quartz found on Earth's crust.
Field identification & locations
Identify by its inability to be scratched by steel, its white coloring, and the lack of distinct cleavage. Commonly found in mountainous regions, riverbeds, and as vein material in various host rocks.
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Mineral
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Mineral/Rock
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