sedimentary

Weathered sandstone or iron-stained quartzite fragment

Quartz-rich sandstone (SiO₂), possibly ferruginous sandstone; exact identification requires testing

AI-generated identification · may be incorrect

Tan-orange, fine-grained, dull to earthy luster, with reddish-brown iron-oxide staining and a darker weathered rind. Likely hardness around 6–7 if quartz-rich; no obvious cleavage, and the apparent grainy texture suggests cemented sand-sized quartz.

Identified September 15, 2026More sedimentary →

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At a glance

Common name: Weathered sandstone or iron-stained quartzite fragment
Scientific name: Quartz-rich sandstone (SiO₂), possibly ferruginous sandstone; exact identification requires testing
Category: sedimentary
Identified: September 15, 2026
Method: Standard

AI Estimated Value

About $0–$5 as an ordinary fragment; $10–$30 if unusually attractive, polished, or from a documented locality.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Probably formed when quartz sand was deposited, compacted, and cemented, then later oxidized and weathered at the surface; its geological age cannot be determined from the image. If metamorphosed, it could instead be quartzite, formed during regional burial and heating.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and occasionally decorative material; quartzite is used for countertops, slabs, aggregate, and ornamental stone. This small fragment has little commercial value.

Geological facts

The orange coloration is commonly produced by hematite or goethite coatings between grains. A dark outer rind may reflect surface weathering, manganese staining, or iron-rich cement.

Field identification & locations

Look for visible sand grains, a gritty texture, and scratching by steel; quartzite generally breaks across grains and is harder, while sandstone often crumbles or breaks around grains. Common worldwide in sedimentary basins and metamorphic mountain belts.