mineral

Quartz-rich rock fragment, likely milky quartz with iron staining

Quartz (SiO₂), possibly in a quartz-rich vein rock

AI-generated identification · may be incorrect

Mostly translucent to milky white with rusty-brown surface staining and a glassy-to-dull luster. Quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and uneven to conchoidal fracture; the photo does not establish the exact specimen composition.

Identified September 28, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly crystallizes from silica-rich hydrothermal fluids in fractures and veins, or from cooling silica-rich melt. Such veins occur in rocks of many ages, so this fragment’s age and precise origin cannot be determined from the image.

Uses & applications

Quartz is used in glass, ceramics, electronics, and construction; attractive or well-formed pieces are collected, though this fragment appears mainly of hobby-collector interest.

Geological facts

Iron oxides can produce the rusty coating visible on quartz. Quartz is one of Earth’s most abundant minerals.

Field identification & locations

Look for hardness sufficient to scratch glass, lack of cleavage, and a glassy fracture; rusty staining alone is not diagnostic. Quartz veins occur worldwide, but a location or test is needed to identify this specimen more confidently.