sedimentary

Quartz-rich sandstone or quartzite fragment

Quartz (SiO₂) with iron-oxide staining; possibly weakly metamorphosed quartzite

AI-generated identification · may be incorrect

White to tan, granular and sugary-textured, with rusty brown hematite/goethite staining and a dark iron-oxide spot; vitreous to dull luster, quartz hardness about 7, no obvious cleavage, and typical specific gravity near 2.65. The photo cannot reliably distinguish sandstone from quartzite.

Identified September 16, 2026More sedimentary →

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Physical properties

Formation & geological history

If sandstone, it formed by deposition, burial, and cementation of quartz sand, commonly in ancient rivers, beaches, or deserts; if quartzite, later heat and pressure recrystallized that sandstone. Exact age and locality are indeterminate from the image.

Uses & applications

Common sandstone is used for building stone, paving, and aggregate; quartzite is used for durable countertops, crushed stone, and decorative slabs. This fragment has little jewelry or collector value.

Geological facts

The rusty coloration is likely iron oxides coating or cementing quartz grains rather than a separate metallic mineral. A glassy quartz-rich fracture and tightly fused grains favor quartzite; visible rounded grains and porosity favor sandstone.

Field identification & locations

Look for individual sand grains, bedding, and porosity for sandstone, versus interlocking quartz grains and very hard, massive texture for quartzite. Common worldwide; estimated value is about $1–$10 for a hand specimen, usually less without provenance.