Dendritic Jasper (Bumblebee like Agate)

Physical Properties

Hardness: 6.5-7 (Mohs scale), Color: Black and yellow/tan swirling pattern, Luster: Vitreous to waxy, Crystal Structure: Microcrystalline trigonal, Cleavage: None/Conchoidal fracture.

Formation & Geological History

Formed from silica-rich groundwater percolating through porous sediment or volcanic ash, with manganese or iron oxides creating the darker dendritic/swirling patterns. Geological age varies by deposit location.

Uses & Applications

Used primarily in lapidary work for cabochons, jewelry, decorative polished stones, and as a collector's specimen for its unique patterns.

Geological Facts

While often called 'Bumblebee' due to the coloring, true Bumblebee Jasper is actually an Indonesian fumerole deposit containing volcanic ash and sulfur. This specimen is a more durable silicate-based jasper/chert with similar aesthetics.

Field Identification & Locations

Identify in the field by its hardness (it will scratch glass) and its opaque, variegated color patterns. Often found in riverbeds or alluvial deposits in volcanic regions.

Identified on: 4/19/2026

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