sedimentary
Bumblebee Jasper
Calcite-bearing Volcanic Tuff containing Orpiment (As2S3) and Realgar (As4S4)
Hardness: 4-5 (Mohs scale), Color: Yellow, orange, black, and grey stripes/patches, Luster: Vitreous to dull, Crystal Structure: Amorphous/microcrystalline, Cleavage: None/Conchoidal, Specific Gravity: 2.6-2.7
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Physical properties
Hardness: 4-5 (Mohs scale), Color: Yellow, orange, black, and grey stripes/patches, Luster: Vitreous to dull, Crystal Structure: Amorphous/microcrystalline, Cleavage: None/Conchoidal, Specific Gravity: 2.6-2.7
Formation & geological history
Formed from volcanic eruptions on Mount Papandayan, Indonesia. It is a sedimentary deposit of volcanic ash (tuff) and sulfur-bearing minerals. The yellow and orange hues come from toxic arsenic sulfides.
Uses & applications
Primarily used as a decorative stone for cabochons in jewelry, carvings, and as a collector's specimen.
Geological facts
Despite the name, it is not a true Jasper (which is quartz-based); it is actually a carbonate-rich volcanic rock. It contains arsenic and should be handled with care, especially during cutting/polishing.
Field identification & locations
Identify by its unique 'bumblebee' or 'wasp' striped patterns of yellow, orange, and black. It is found exclusively in the volcanic fumaroles of West Java, Indonesia. Caution should be used due to arsenic content.
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