metamorphic

Weathered quartz-rich pebble, possibly metasandstone

Quartz-rich metasandstone (provisional); mainly SiO₂ with minor feldspar, mica, or iron oxides

AI-generated identification · may be incorrect

Fine-grained, dull to slightly sparkly tan-gray surface with rounded weathering; likely Mohs hardness 6–7, no obvious cleavage, and vitreous to earthy luster. Exact identification requires a fresh surface and tests for streak, hardness, and acid reaction.

Identified September 8, 2026More metamorphic →

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At a glance

Common name: Weathered quartz-rich pebble, possibly metasandstone
Scientific name: Quartz-rich metasandstone (provisional); mainly SiO₂ with minor feldspar, mica, or iron oxides
Category: metamorphic
Identified: September 8, 2026
Method: Standard

AI Estimated Value

Typically $0–$5 as an ordinary pebble; up to about $5–$20 if locality-specific, unusually attractive, or confirmed as a notable rock type.

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

Likely a naturally weathered river, beach, or glacial pebble derived from sandstone altered by low-grade metamorphism; age is indeterminate from the photograph. Its surface shows oxidation and abrasion rather than crystal growth.

Uses & applications

Primarily a natural collecting specimen or decorative pebble; quartz-rich material can be used as aggregate or building stone when present in larger sound deposits, but this small piece has no practical industrial value.

Geological facts

The granular sparkle may come from interlocking quartz grains or tiny mica flakes. A glass-scratching test and examination of a broken face would distinguish it from softer iron-stained sandstone or quartzite.

Field identification & locations

Common in terrains containing sandstone, quartzite, or metamorphic rocks; look for gritty texture, abundant quartz, and resistance to steel scratching. Vinegar should produce no fizz unless carbonate minerals are present.