mineral

Tumbled quartz-rich pebble

Likely quartz-bearing chert or jasper; primarily microcrystalline SiO₂

AI-generated identification · may be incorrect

Small rounded, yellow-brown stone with a dull to slightly waxy luster and mottled appearance. Quartz-rich material has Mohs hardness about 6.5–7, no visible cleavage, cryptocrystalline structure, and specific gravity near 2.6; exact identification is limited by the image.

Identified August 28, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed from silica-rich sediment or volcanic-derived fluids, then naturally or artificially rounded by abrasion; age and locality cannot be determined visually. Iron oxides probably produce the yellow-brown coloration.

Uses & applications

Commonly collected as a curiosity, tumbled stone, or lapidary material; suitable for cabochons and small decorative objects, but this specimen has little commercial value.

Geological facts

Jasper and chert are varieties of microcrystalline quartz distinguished mainly by opacity, impurities, and texture rather than crystal shape.

Field identification & locations

Look for hardness sufficient to scratch glass, a nonmetallic waxy luster, and absence of fizz in dilute acid; a streak, specific-gravity test, and close inspection can distinguish jasper, chert, and other quartz-rich rocks. Similar material occurs worldwide in sedimentary and volcanic terrains.