sedimentary

Bumblebee Jasper

Carbonate-rich volcanic rock containing Sulfur and Arsenic (Realgar/Orpiment)

Hardness: 5 on Mohs scale; Color: Distinct yellow, orange, and black banding; Luster: Waxy to dull (high polish when worked); Crystal Structure: Orthorhombic/Monoclinic inclusions; Specific Gravity: ~2.6-2.7

Hardness: 5 on Mohs scale
Color: Distinct yellow, orange, and black banding
Luster: Waxy to dull (high polish when worked)

Identified June 13, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed in volcanic fumaroles where steam and gases escape from the Earth. It is a complex sedimentary-volcanic rock composed of volcanic ash, gypsum, sulfur, and orpiment/realgar. Most specimens come from West Java, Indonesia.

Uses & applications

Primarily used for lapidary work, jewelry (cabochons), and as decorative polished spheres or display specimens for collectors.

Geological facts

Despite the name, it is not actually a true Jasper (which is microcrystalline quartz) but rather a mixture of volcanic ash and carbonate minerals. The yellow and orange bands are caused by toxic arsenic-sulfide minerals like orpiment.

Field identification & locations

Identified by its vivid 'bumblebee' stripes of yellow, orange, grey, and black. It is found almost exclusively near Mount Papandayan in Indonesia. Collectors should wash hands after handling raw specimens due to the arsenic content.

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