sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron inclusions
Hardness: 6.5-7 (Mohs scale); Color: Deep brownish-red; Luster: Vitreous to dull; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Deep brownish-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Deep brownish-red; Luster: Vitreous to dull; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica in sediments or volcanic ash, where iron oxides precipitate within the quartz to create the dark red color. Typically billions to millions of years old.
Uses & applications
Commonly used as a gemstone for tumbled stones, beads, and carvings. Also used in ornamental architecture and as a collector's specimen.
Geological facts
Red Jasper has been used since antiquity in jewelry and religious seals. It is often called the 'stone of endurance' in metaphysical circles due to its density and deep color.
Field identification & locations
Field identification involves its opaque nature, high hardness (will scratch glass), and lack of visible crystalline structures. Commonly found in South Africa, Brazil, and the USA.
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