mineral
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
Mohs hardness of 7, white to translucent color, dull to vitreous luster, hexagonal crystal system, no cleavage, conchoidal fracture. The specimen shows significant micro-fracturing and iron oxide staining.
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Physical properties
Mohs hardness of 7, white to translucent color, dull to vitreous luster, hexagonal crystal system, no cleavage, conchoidal fracture. The specimen shows significant micro-fracturing and iron oxide staining.
Formation & geological history
Formed via hydrothermal activity where silica-rich fluids cooled within fractures of a host rock. This specimen appears to be a vein that has weathered out of its original surrounding bedrock.
Uses & applications
Used industrially in glass making, electronics (semiconductors), and as an abrasive. Also used as landscaping stone and for hobbyist collecting.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz gets its white color from microscopic fluid inclusions trapped during crystal growth.
Field identification & locations
Identify by its hardness (it will scratch glass), lack of reaction to acid, and typical white appearance. Commonly found in mountainous regions or riverbeds.
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Epidote
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Mineral
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Mineral/Rock