igneous
Bumblebee Jasper
Fossiliferous Volcanic Rock (composed of Calcium Carbonate, Manganese Oxides, and Arsenic Sulfides)
Hardness: 4-5 (Mohs scale), Color: bright orange, yellow, black, and grey banding, Luster: Vitreous to dull, Crystal structure: Amorphous/Microcrystalline, Specific gravity: ~2.6
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Physical properties
Hardness: 4-5 (Mohs scale), Color: bright orange, yellow, black, and grey banding, Luster: Vitreous to dull, Crystal structure: Amorphous/Microcrystalline, Specific gravity: ~2.6
Formation & geological history
Formed in a volcanic environment during the deposition of mineral-rich fumarole gases and volcanic ash. It is technically an eclipse of volcanic matter rather than a true Jasper (which is microcrystalline quartz). Found specifically in West Java, Indonesia near Mount Papandayan.
Uses & applications
Primarily used in jewelry as cabochons, pendants, and beads; also a popular specimen for mineral collectors and metaphysical enthusiasts.
Geological facts
Despite its name, it is not a true Jasper because it lacks a high quartz content; it is actually a mixture of volcanic ash and minerals. The vibrant yellow/orange colors are caused by Arsenic, so it should be handled with care and never ingested or inhaled as dust.
Field identification & locations
Identify by its distinctive 'bumblebee' stripes of vivid yellow/orange against black/grey. It is found almost exclusively in volcanic vents in Indonesia. Collectors should look for sharp color contrast and well-defined banding.
