sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 Mohs; Color: Opaque red/terracotta with patterns; Luster: Vitreous to greasy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Opaque red/terracotta with patterns
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Opaque red/terracotta with patterns; Luster: Vitreous to greasy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed when silica-rich fluids permeate through volcanic ash or sedimentary rocks, often resulting from hydrothermal processes or the accumulation of silica-rich organisms over millions of years.
Uses & applications
Commonly used in lapidary work, jewelry (beads, cabochons), ornamental carvings, and as a healing stone in metaphysical practices.
Geological facts
Red Jasper has been used since antiquity for seals and amulets. It was known as the 'rain bringer' in some Native American cultures and was featured in the breastplate of the High Priest in Biblical times.
Field identification & locations
Identified in the field by its opaque red color, conchoidal fracture, and inability to be scratched by a steel knife. It is frequently found in riverbeds or coastal deposits.
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