sedimentary

Rounded gray stone, likely slate or fine-grained sandstone

Probable slate (low-grade metamorphosed shale) or lithic sandstone; exact identification requires testing

AI-generated identification · may be incorrect

Gray, fine-grained, dull to weakly satin luster, with dark intersecting fractures or veins. Likely hardness about 3–6 Mohs; appears dense and fine-textured, without visible crystals or cleavage in the image.

Identified August 11, 2026More sedimentary →

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At a glance

Common name: Rounded gray stone, likely slate or fine-grained sandstone
Scientific name: Probable slate (low-grade metamorphosed shale) or lithic sandstone; exact identification requires testing
Category: sedimentary
Identified: August 11, 2026
Method: Standard

AI Estimated Value

Approximately $0–$5 as an ordinary loose specimen; more if confirmed as an attractive or unusual local geological sample.

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

If slate, it formed when shale was compressed and metamorphosed during mountain building; if sandstone, it formed by cementation of sand grains in ancient sedimentary basins. Age and locality cannot be determined visually.

Uses & applications

Common slate is used for roofing, tiles, paving, and décor; sandstone is used as building and landscaping stone. This rounded fragment has minimal commercial or jewelry value.

Geological facts

The smooth shape likely reflects water or abrasion, while the dark lines may be natural fractures, mineral-filled seams, or surface markings. A streak, hardness, and acid test would distinguish likely rock types.

Field identification & locations

Look for planar splitting and silky foliation for slate, or gritty individual grains for sandstone; a steel nail scratches softer specimens. Common worldwide in sedimentary and metamorphic terrains.