sedimentary
Red Jasper
Silicon Dioxide (SiO2)
Hardness: 6.5-7.0 (Mohs scale); Color: Brick red to brownish-red; Luster: Vitreous to dull; Crystal structure: Microcrystalline/Trigonal; Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7.0 (Mohs scale); Color: Brick red to brownish-red; Luster: Vitreous to dull; Crystal structure: Microcrystalline/Trigonal; Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed when fine silica-rich materials are deposited in sedimentary environments or through the replacement of organic matter. The red color is caused by iron (hematite) inclusions.
Uses & applications
Commonly used for lapidary work, jewelry, ornamental carvings, and as a decorative stone in landscaping.
Geological facts
Jasper is an opaque variety of chalcedony. It has been used since antiquity as a gemstone and for ritual tools in various cultures.
Field identification & locations
Identify by its rich red color, opacity, and smooth, waxy surface when polished. Commonly found in riverbeds and desert environments globally, including the USA, Brazil, and India.
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