sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to golden brown with dark banding, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (microcrystalline), Cleavage: None/Conchoidal fracture.
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to golden brown with dark banding, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (microcrystalline), Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed primarily through the deposition of silica from water or volcanic ash. The yellow color is due to the presence of goethite or other iron hydroxide minerals. These are common in sedimentary environments or hydrothermal veins.
Uses & applications
Primarily used for lapidary work, jewelry (beads, cabochons), and as a collector's stone. It is also historically used for ornamental purposes and as a 'nurturing' stone in metaphysical circles.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning spotted stone. This specific specimen is likely a water-worn or tumbled river pebble.
Field identification & locations
Identify by its hardness (cannot be scratched by a steel knife), smooth waxy feel when polished, and opacity. Commonly found in riverbeds, desert washes, and coastal deposits globally.
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