mineral
Red Jasper (Chalcedony)
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red with some chalcedony banding, Luster: Dull to waxy, Crystal Structure: Microcrystalline, Cleavage: None (conchoidal fracture)
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Brick red to brownish-red with some chalcedony banding, Luster: Dull to waxy, Crystal Structure: Microcrystalline, Cleavage: None (conchoidal fracture)
Formation & geological history
Formed from the deposition of silica from water-rich environments or hydrothermal fluids, often in volcanic or sedimentary beds. The red color comes from high iron content. Common in Precambrian and Phanerozoic strata.
Uses & applications
Primarily used for lapidary work including cabochons, beads, and decorative carvings; historically used for seal stones and ornaments.
Geological facts
Jasper is a variety of chalcedony that is opaque due to its high percentage of mineral inclusions. Red jasper was known as the 'Blood of Mother Earth' in some ancient cultures and was often used in amulets for protection.
Field identification & locations
Identify by its rich red color, extreme hardness (it will scratch glass), and smooth, waxy feel when wet or polished. Commonly found in riverbeds and gravel pits in areas with volcanic or sedimentary history.
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