mineral

Polished bumblebee jasper (likely)

Calcite–sulfur-rich volcanic breccia, commonly sold as “bumblebee jasper”

AI-generated identification · may be incorrect

Yellow-orange, black, and gray banded/mottled material with a waxy to glossy polish; hardness is variable, roughly Mohs 3–5, and it may contain soft calcite and sulfur-bearing minerals. It is opaque, fine-grained, and lacks visible cleavage in the polished form.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Forms from hydrothermal alteration and cavity-filling in volcanic rocks, especially near Indonesian volcanoes such as Mount Papandayan; specimens are geologically young relative to bedrock and are not true jasper in the strict mineralogical sense.

Uses & applications

Used mainly for cabochons, beads, carvings, and lapidary collecting; it is too soft and compositionally variable for durable architectural use. Avoid acids, ultrasonic cleaners, prolonged water exposure, and heat.

Geological facts

The vivid yellow color is commonly associated with sulfur and yellow calcite, while black areas may include manganese oxides and volcanic matrix. The name is commercial rather than a formal mineral species.

Field identification & locations

Identify it by its striking yellow-black pattern, volcanic-looking matrix, relatively low hardness, and possible acid reaction from calcite; common sources are Indonesia. Typical polished cabochon or palm-stone value is about $10–$60, with exceptional pieces $75–$150.