igneous
Quartz-rich pegmatite or quartz vein rock
Milky quartz (SiO₂), likely with iron-oxide staining and minor feldspar
AI-generated identification · may be incorrectWhite to translucent quartz with pink-orange and purple-brown iron staining; vitreous to sugary luster, massive texture, no obvious cleavage, Mohs hardness about 7, and specific gravity near 2.65.
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Physical properties
White to translucent quartz with pink-orange and purple-brown iron staining; vitreous to sugary luster, massive texture, no obvious cleavage, Mohs hardness about 7, and specific gravity near 2.65.
Formation & geological history
Likely formed when silica-rich hydrothermal fluids or late-stage granitic magma crystallized in a fracture, probably during a Precambrian or younger intrusive event; the rusty colors developed through later oxidation of iron-bearing minerals.
Uses & applications
Common quartz has limited specimen value but is used in glass, ceramics, abrasives, and electronics; attractive pieces may be cut or polished as ornamental stone.
Geological facts
Quartz commonly fractures conchoidally and can show translucent edges. The reddish coloration is typically hematite or limonite rather than a separate gemstone mineral.
Field identification & locations
Look for glassy hardness, inability to scratch it with a steel knife, and quartz-like fracture; common in quartz veins, pegmatites, granitic terrains, and stream gravels worldwide. The image alone cannot confirm the exact rock classification.
