metamorphic

Tumbled dalmatian jasper (likely)

Microcrystalline quartz/chalcedony with black amphibole or aegirine inclusions; commonly sold as “dalmatian jasper”

AI-generated identification · may be incorrect

Small polished pebble, cream-gray with irregular black spots and a subdued waxy-to-glassy luster. Quartz hardness is about 6.5–7 Mohs; dense, opaque, and typically lacks visible cleavage.

Identified September 13, 2026More metamorphic →

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Physical properties

Small polished pebble, cream-gray with irregular black spots and a subdued waxy-to-glassy luster. Quartz hardness is about 6.5–7 Mohs; dense, opaque, and typically lacks visible cleavage.

Formation & geological history

Usually an altered volcanic or microcrystalline silica-rich rock, with dark mineral inclusions producing the spots; exact geological age and locality cannot be determined from the image. Commercial material commonly comes from Mexico or South Africa.

Uses & applications

Used for cabochons, beads, worry stones, carvings, and decorative specimens; generally inexpensive and valued mainly for appearance.

Geological facts

Despite its trade name, much “dalmatian jasper” is not true jasper in the strict mineralogical sense. The black inclusions are commonly amphibole-group minerals rather than tourmaline.

Field identification & locations

Identify by its opaque pale body, rounded black spots, fine-grained texture, and polish; a streak, hardness, and specific-gravity test can help distinguish it from dyed or synthetic material. The photograph alone cannot confirm the exact variety.