mineral
Milky quartz-rich vein rock
Quartz, SiO₂, likely massive or microcrystalline quartz
AI-generated identification · may be incorrectHardness 7; white to gray translucent color, vitreous-to-waxy luster, no obvious cleavage, conchoidal fracture, and irregular massive crystal structure. Brown staining likely reflects iron oxides or host-rock inclusions.
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Physical properties
Hardness 7; white to gray translucent color, vitreous-to-waxy luster, no obvious cleavage, conchoidal fracture, and irregular massive crystal structure. Brown staining likely reflects iron oxides or host-rock inclusions.
Formation & geological history
Formed when silica-rich hydrothermal fluids filled fractures and crystallized, commonly during igneous or metamorphic activity; its exact geological age cannot be determined from the image.
Uses & applications
Used as a silica source for glass, ceramics, and engineered stone; attractive pieces are collected, though this specimen is not gem quality.
Geological facts
The cloudy appearance results from microscopic fluid inclusions, fractures, and impurities. Quartz is one of Earth’s most abundant and chemically resistant minerals.
Field identification & locations
Identify it by its glassy translucence, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; it commonly occurs in veins in granite, metamorphic rocks, and ore deposits worldwide.
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