sedimentary
Jasper Pebble
Silicon dioxide (SiO2) with iron oxide impurities
Hardness: 6.5-7 (Mohs scale), Color: Reddish-brown with grayish and white veins, Luster: Dull to waxy, Crystal Structure: Microcrystalline/Cryptocrystalline, Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Reddish-brown with grayish and white veins, Luster: Dull to waxy, Crystal Structure: Microcrystalline/Cryptocrystalline, Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from water-rich environments or volcanic ash into sedimentary layers, often colored by iron inclusion during lithification. This specimen likely weathered out of a larger vein and was rounded by water transport.
Uses & applications
Commonly used for lapidary work, jewelry (beads and cabochons), home decor, and as a collector's stone or aquarium gravel.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek for 'spotted stone'. It was a favorite gemstone in the ancient world, mentioned in several historical and religious texts.
Field identification & locations
Identify in the field by its hardness (cannot be scratched by a steel knife) and its smooth, waxy surface when wet or polished. Commonly found in riverbeds, beaches, and desert environments worldwide.
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