sedimentary
Bumble Bee Jasper
Calcite-bearing Volcanic Tuff (not a true Jasper)
Hardness: 5 (Mohs scale), Color: Yellow, orange, black, and gray swirls, Luster: Vitreous to dull, Crystal Structure: Trigonal (as calcite)/Amorphous, Cleavage: None, Specific Gravity: 2.6-2.7
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Physical properties
Hardness: 5 (Mohs scale), Color: Yellow, orange, black, and gray swirls, Luster: Vitreous to dull, Crystal Structure: Trigonal (as calcite)/Amorphous, Cleavage: None, Specific Gravity: 2.6-2.7
Formation & geological history
Formed from volcanic sediment and ash flows (tuff) infused with sulfur and manganese. It originated approximately 10-20 million years ago and is found specifically in fumarole environments near active volcanoes.
Uses & applications
Primarily used in jewelry making (cabochons), ornamental carvings, and for mineral collecting. It is rarely used in industrial applications due to its relative softness and chemical sensitivity.
Geological facts
Despite its name, it is technically a carbonate-rich volcanic rock, not a Jasper (which is silica-based). The vibrant yellow and orange colors are caused by sulfur, while the black bands are created by manganese oxides or arsenic sulfide (orpiment).
Field identification & locations
Identify by its distinctive black and bright yellow/orange banding resembling a bee. It is primarily found at Mount Papandayan in West Java, Indonesia. Collectors should be aware it contains sulfur and traces of arsenic, so washing hands after handling raw specimens is recommended.
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