sedimentary
Bumblebee Jasper
Calcite with Arsenic and Sulfur inclusions
Hardness: 3 to 5 (Mohs scale); Colors: Yellow, orange, black, and grey banding; Luster: Dull to vitreous; Crystal Structure: Trigonal/Amorphous; Cleavage: None
- Hardness
- 3 to 5 (Mohs scale)
- Luster
- Dull to vitreous
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Physical properties
Hardness: 3 to 5 (Mohs scale); Colors: Yellow, orange, black, and grey banding; Luster: Dull to vitreous; Crystal Structure: Trigonal/Amorphous; Cleavage: None
Formation & geological history
Formed in volcanic fumaroles (vents) where mineral-rich gases escape, cooling to deposit layers of sulfur (yellow/orange), manganese oxides (black), and calcium carbonate. Primarily sourced from West Java, Indonesia.
Uses & applications
Mainly used in lapidary arts for cabochons, jewelry, and metaphysical collecting. Not suitable for heavy industrial use due to its relative softness.
Geological facts
Despite its name, it is not a true jasper (which is silicate-based) but rather a mineraloid conglomerate. The vibrant yellow color is derived from sulfur and potentially toxic arsenic minerals like orpiment.
Field identification & locations
Identified by its distinctive bumblebee-like color banding of yellow, orange, and black. Collectors should handle raw specimens with care due to sulfur and arsenic content; it is often found near active volcanic regions.
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