sedimentary
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Deep red to brownish-red; Luster: Vitreous to dull; Crystal structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep red to brownish-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Deep red to brownish-red; Luster: Vitreous to dull; Crystal structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich fluids in cracks or volcanic cavities, often within sedimentary or volcanic environments. The red color comes from high concentrations of iron oxide (hematite) during formation.
Uses & applications
Commonly used for lapidary work, jewelry (beads, cabochons), decorative carvings, and as a popular stone in the metaphysical and collecting communities.
Geological facts
Jasper is an opaque variety of chalcedony. It has been used since antiquity for royal seals and amulets; in many cultures, it was known as the 'supreme nurturer' for its supposed grounding properties.
Field identification & locations
Identify by its opaque nature (unlike agate which is translucent), its smooth waxy feel when polished, and its characteristic deep brick-red color. It can often be found in riverbeds or near volcanic deposits.
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