sedimentary
Bumblebee Jasper
Anhydrite with Sulfur, Hematite, and Orpiment (SiO2/CaSO4 mixture)
Hardness: 3-5 (Mohs scale), Color: Yellow, orange, black, and grey banding, Luster: Vitreous to greasy, Crystal Structure: Trigonal/Amorphous, Density: ~2.6
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Physical properties
Hardness: 3-5 (Mohs scale), Color: Yellow, orange, black, and grey banding, Luster: Vitreous to greasy, Crystal Structure: Trigonal/Amorphous, Density: ~2.6
Formation & geological history
Formed in the fumaroles of active volcanoes where steam and heat deposit mineral layers. Specifically associated with the Mount Papandayan volcano in Indonesia. It is not a true jasper but a combination of volcanic matter and anhydrite.
Uses & applications
Primarily used in the jewelry industry for cabochons and as a collector's specimen due to its unique vibrant banding. Its toxicity due to arsenic content makes it unsuitable for industrial or construction use.
Geological facts
Technically not a jasper but a calcium carbonate mineral found specifically in West Java, Indonesia. The yellow and orange bands contain Orpiment, which is an arsenic sulfide mineral that is toxic if inhaled as dust.
Field identification & locations
Identify by the distinct bright yellow and orange sulfur bands mixed with black volcanic ash. Can be found in volcanic regions of Indonesia. Collectors should handle raw specimens with care and wash hands after use.
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