igneous
Bumble Bee Jasper
Volcanic Tuff (mixture of SiO2, CaCo3, S, and As2S3)
Hardness: 5.0 on Mohs scale; Color: Distinct yellow, orange, and black banding; Luster: Waxy to resinous when polished; Crystal Structure: Amorphous/Microcrystalline; Cleavage: None
- Hardness
- 5
- Color
- Distinct yellow, orange, and black banding
- Luster
- Waxy to resinous when polished
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Physical properties
Hardness: 5.0 on Mohs scale; Color: Distinct yellow, orange, and black banding; Luster: Waxy to resinous when polished; Crystal Structure: Amorphous/Microcrystalline; Cleavage: None
Formation & geological history
Formed from volcanic vents in Indonesia through the deposition of volcanic ash and minerals. It is a relatively young geological formation (Pleistocene epoch) created by fumarole activity.
Uses & applications
Used primarily in lapidary arts for cabochons, carvings, and heart-shaped polished stones. It is popular in jewelry and as an ornamental gemstone for collectors.
Geological facts
Despite its name, it is not a true Jasper (which is quartz-based). It is actually a carbonate-rich volcanic rock containing realgar (arsenic) and sulfur, which give it its vibrant yellow and orange colors.
Field identification & locations
Identify in the field by its unique 'bumble bee' striped patterns and its proximity to active volcanic vents. Can be found almost exclusively on the island of Java, Indonesia. Collectors should handle with care as it contains sulfur and arsenic.
