mineral

Quartz-rich rock or quartz specimen

Quartz (SiO₂), likely massive quartz or quartz-bearing host rock

AI-generated identification · may be incorrect

Quartz has Mohs hardness 7, vitreous luster, conchoidal fracture, no cleavage, and specific gravity about 2.65. The specimen appears tan-gray and massive, possibly iron-stained or mixed with feldspar and other minerals; crystal form is not clearly visible.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, pegmatites, and igneous rocks, or forms by metamorphic recrystallization and sedimentary cementation. Its age depends on the host rock and cannot be determined from the image.

Uses & applications

Quartz is used in glass, ceramics, abrasives, electronics, countertops, and engineered stone; clear varieties are used as gemstones. This ordinary specimen has little commercial value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under mechanical stress.

Field identification & locations

Identify it by its hardness, glassy appearance, lack of cleavage, and inability to scratch with a steel nail while scratching ordinary glass. Common localities include igneous and metamorphic terrains worldwide; the image is insufficient to confirm a pure quartz specimen.