sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Hardness: 6.5-7.0 on the Mohs scale. Color: Brick red to brownish-red. Luster: Dull or waxy when raw, vitreous when polished. Crystal Structure: Hexagonal (Trigonal), microcrystalline varieties. Cleavage: None (conchoidal fracture). Specific Gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Dull or waxy when raw, vitreous when polished
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Physical properties
Hardness: 6.5-7.0 on the Mohs scale. Color: Brick red to brownish-red. Luster: Dull or waxy when raw, vitreous when polished. Crystal Structure: Hexagonal (Trigonal), microcrystalline varieties. Cleavage: None (conchoidal fracture). Specific Gravity: 2.58-2.91.
Formation & geological history
Formed through the deposition of silica in hydrothermal veins or as a chemical sedimentary rock in marine environments. Its red color is derived from high concentrations of iron oxide (hematite) during its formation. It can be found in strata ranging from Precambrian to recent geological ages.
Uses & applications
Commonly used in lapidary work for cabochons, beads, and decorative carvings. Industrially, it has been used for abrasive purposes or in construction as an ornamental stone. It is highly popular in the metaphysical and rock collecting communities.
Geological facts
Jasper was a favorite gem in antiquity, mentioned in various historical texts including the Bible. The name comes from the Greek word 'iaspis', meaning 'spotted stone.' It is an opaque variety of chalcedony that can contain up to 20% foreign materials, which accounts for its diverse color palette.
Field identification & locations
Identify in the field by its distinctive red color, opacity (it will not let light through even at thin edges), and its smooth, shell-like (conchoidal) fracture pattern. Commonly found in riverbeds or desert regions of South Africa, Brazil, India, and the southwestern United States.
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