sedimentary (microcrystalline quartz)
Red Jasper (River Pebble)
Silicon Dioxide (SiO2) with hematite impurities
Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep maroon; Luster: Dull to waxy when unpolished; Crystal structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to deep maroon
- Luster
- Dull to waxy when unpolished
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep maroon; Luster: Dull to waxy when unpolished; Crystal structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91
Formation & geological history
Formed when fine-grained silica (found in volcanic flows or sea floors) is replaced or saturated with iron oxides. This rounded specimen was likely weathered and smoothed by water transport in a river or coastal environment. Common in Precambrian and Phanerozoic deposits.
Uses & applications
Used primarily for lapidary work, jewelry (cabochons), interior decoration, and as a popular stone for tumbling. In ancient times, it was used for cylindrical seals and amulets.
Geological facts
Jasper is an opaque variety of chalcedony. The red color is caused by the inclusion of iron (Hematite). In ancient Egypt, red jasper was associated with the 'Blood of Isis' and used as a protective charm.
Field identification & locations
Identify by its solid red color, inability to be scratched by a steel knife, and smooth/rounded texture if found in water. Commonly found in riverbeds, gravity deposits, and shorelines worldwide, including the US (Oregon, Idaho), India, and Brazil.
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Black Jasper (Black Onyx substitute)
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Yellow Jasper
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Jasper
Jasper (Silicon Dioxide, SiO2)
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Jasper River Pebble
Silicon Dioxide (SiO2)
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Red Jasper
Jasper (SiO2) with Hematite (Fe2O3) inclusions
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