sedimentary (volcanic)
Bumblebee Jasper (technically Bumblebee Stone)
Calcite, Aragonite, and Realgar/Orpiment mixture (SiO2 + CaCO3 + As2S3/As2S2)
Hardness: 3 to 5 (Mohs scale); Color: Yellow, orange, black, and grey bands; Luster: Waxy to vitreous when polished; Crystal Structure: Rhombohedral (mostly Microcrystalline); Cleavage: None/Indistinct; Specific Gravity: 2.6 - 2.8
- Hardness
- 3 to 5 (Mohs scale)
- Color
- Yellow, orange, black, and grey bands
- Luster
- Waxy to vitreous when polished
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Physical properties
Hardness: 3 to 5 (Mohs scale); Color: Yellow, orange, black, and grey bands; Luster: Waxy to vitreous when polished; Crystal Structure: Rhombohedral (mostly Microcrystalline); Cleavage: None/Indistinct; Specific Gravity: 2.6 - 2.8
Formation & geological history
Formed in volcanic fumarole environments where volcanic ash meets carbonate-rich sediment. It originated during the Neogene-Quaternary periods in Indonesia.
Uses & applications
Primarily used in the lapidary arts for jewelry, cabochons, and decorative ornamental carvings. Also popular among mineral collectors for its unique aesthetic.
Geological facts
Despite its name, it is not a true Jasper because it is composed mainly of carbonate minerals (Calcite/Aragonite) rather than silicates. The vibrant yellow/orange colors are caused by toxic arsenic sulfide minerals (Realgar and Orpiment).
Field identification & locations
Identify by its distinct high-contrast yellow, orange, and black banding. Most common specimens come solely from Mount Papandayan in West Java, Indonesia. Collectors should handle raw specimens with care due to the arsenic content, though polished pieces are generally safe.
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