sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
Hardness: 6.5-7 (Mohs); Color: Red, brownish-red; Luster: Vitreous to dull; Crystal structure: Microcrystalline/Trigonal; Cleavage: None; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Red, brownish-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Red, brownish-red; Luster: Vitreous to dull; Crystal structure: Microcrystalline/Trigonal; Cleavage: None; Specific gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich fluids within cracks or volcanic rocks, often associated with iron-rich environments over millions of years. It typically forms in hydrothermal or sedimentary settings.
Uses & applications
Used primarily for semi-precious jewelry, decorative carvings, metaphysical stones, and lapidary art. Historically used for seals and amulets.
Geological facts
Jasper is an opaque variety of chalcedony. The red color is caused by the presence of iron (hematite). It has been a sacred stone for many cultures throughout history, including ancient Egyptians and Native Americans.
Field identification & locations
Identify in the field by its deep red color, conchoidal fracture, and extreme hardness (it will scratch glass). Commonly found in river beds or areas with exposed sedimentary or volcanic rock in locations like India, Brazil, Australia, and the Southwest USA.
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