sedimentary

Quartz-rich sandstone or quartzite

Quartz (SiO₂)-rich clastic rock; possibly weakly metamorphosed quartzite

AI-generated identification · may be incorrect

Tan-brown, massive, and granular with abundant translucent quartz grains and scattered reflective cleavage surfaces. Quartz has Mohs hardness 7, vitreous luster, no cleavage, and specific gravity about 2.65; the rock’s texture suggests cemented or recrystallized quartz grains.

Identified September 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Most likely formed as sand deposited, compacted, and cemented in a sedimentary basin; stronger grain interlocking could indicate later metamorphism into quartzite. Exact geological age cannot be determined from the photograph.

Uses & applications

Ordinary sandstone is used for building stone, paving, aggregate, and landscaping; quartzite is used for durable construction stone, countertops, and crushed aggregate. This irregular specimen has modest collector value.

Geological facts

The visible sparkle is probably quartz rather than metallic mineral. A fresh broken surface and acid test help distinguish sandstone from carbonate rocks, while quartzite typically breaks across grains rather than around them.

Field identification & locations

Common in sedimentary basins and metamorphic mountain belts worldwide. Identify with a steel nail or knife: quartz-rich material resists scratching; sandstone usually shows visible grains and may crumble, whereas quartzite is very hard and compact.