sedimentary

Bumblebee Jasper

Calcite-bearing Volcanic Tuff containing Sulfur and Arsenic (Orpiment/Realgar)

AI-generated identification · may be incorrect

Hardness: 3-4 (Mohs); Color: Yellow, orange, black, and grey banding; Luster: Waxy to vitreous when polished; Structure: Microcrystalline; Specific Gravity: ~2.6.

Hardness: 3-4 (Mohs)
Color: Yellow, orange, black, and grey banding
Luster: Waxy to vitreous when polished

Identified April 29, 2026More sedimentary →

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Physical properties

Hardness: 3-4 (Mohs); Color: Yellow, orange, black, and grey banding; Luster: Waxy to vitreous when polished; Structure: Microcrystalline; Specific Gravity: ~2.6.

Formation & geological history

Formed from volcanic sediment and volcanic ash deposits in fumarole environments where minerals like sulfur and orpiment precipitate. It is a relatively young geological material found near active volcanoes.

Uses & applications

Primarily used as a lapidary material for jewelry, cabochons, and decorative ornamental carvings like the skull shown.

Geological facts

Despite its name, it is technically a carbonate-rich volcanic rock rather than a true Jasper. It contains sulfur (yellow) and arsenic-containing minerals (orpiment/realgar), so it is toxic and should be handled with care, especially during cutting.

Field identification & locations

Identify by its unique 'bumblebee' stripes of yellow and black. It is famously and exclusively found at Mount Papandayan in West Java, Indonesia. Collectors should look for vibrant, distinct banding.