mineral

Quartz-rich rock, likely milky quartz with iron staining

Mostly quartz (SiO₂); exact rock type cannot be confirmed from the image

AI-generated identification · may be incorrect

White to gray, opaque and glassy-to-dull with rusty-brown staining; quartz has Mohs hardness 7, trigonal crystal structure, no cleavage, and specific gravity about 2.65. The specimen appears massive and irregular rather than showing distinct crystals.

Identified September 25, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed when silica-rich fluids filled a fracture and quartz crystallized; iron oxides caused the brown staining. Such veins occur in rocks of many geological ages, which cannot be determined visually here.

Uses & applications

Common quartz is used in glass and industrial silica; attractive pieces may be kept as specimens or used in crafts, but this example appears to have little gem or commercial value.

Geological facts

Quartz is among Earth’s most abundant minerals and resists weathering, so quartz-rich fragments are common in soils and stream gravels.

Field identification & locations

Look for its hardness (it can scratch glass), lack of cleavage, and often irregular fracture; a simple image cannot establish whether the matrix includes other minerals. Quartz veins are widespread worldwide.