sedimentary
Red Jasper (possibly Mookaite)
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5-7 (Mohs scale), Color: Brick red with gray/cream mottling, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Brick red with gray/cream mottling, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich fluids in volcanic ash or sedimentary beds. The red color is usually due to iron (hematite) inclusions within the cryptocrystalline quartz structure.
Uses & applications
Primarily used for lapidary arts, jewelry (cabochons and beads), decorative ornaments, and as a popular specimen for crystal healing and collections.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'jasper' comes from the Greek word 'iaspis', meaning 'spotted stone'. It was highly prized in the ancient world for its colors and ability to take a high polish.
Field identification & locations
Identify by its opacity, smooth waxy feel when polished, and inability to be scratched by a steel knife. It is commonly found in India, Brazil, Australia, and the western United States. Tumbled stones like this are common in gift shops.
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