mineral

Polished green jasper/chert pebbles (likely)

Microcrystalline quartz, SiO₂; varieties may include jasper or chert

AI-generated identification · may be incorrect

Opaque, mottled green, brown, and dark gray pebbles with a waxy-to-dull polish and no visible crystals. Quartz hardness is about 7 Mohs; individual identification and specific gravity cannot be determined reliably from the photo.

Identified October 17, 2026More mineral →

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Physical properties

Formation & geological history

Likely silica-rich material formed as microscopic quartz in sedimentary or volcanic settings, then rounded by transport and polished. Its geological age and exact source cannot be established from the image.

Uses & applications

Decorative and collectible stones; jasper and chert are also used for carvings, beads, and small ornaments.

Geological facts

Jasper is an opaque variety of microcrystalline quartz; chert is a closely related rock, and visual appearance alone may not distinguish them.

Field identification & locations

The rounded shapes and mottled, opaque surfaces fit polished or naturally smoothed silica-rich pebbles. Confirm with hardness, streak, and magnification; common examples occur in gravel deposits worldwide.