sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) impurities
Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull or waxy when raw, vitreous when polished; Crystal Structure: Microcrystalline/Trigonal; 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 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull or waxy when raw, vitreous when polished; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich sediments or volcanic ash that undergo diagenesis. The intense red color is caused by the inclusion of iron oxide (hematite) during its original formation millions of years ago, often found in hydrothermal veins or as nodules in sedimentary rocks.
Uses & applications
Commonly used in lapidary work for making cabochons, beads, and carvings for jewelry. It is also used as a decorative stone in landscaping and has been used historically for seals and talismans.
Geological facts
Red Jasper was known as the 'Blood of Mother Earth' in some ancient cultures and was frequently used in the amulets of ancient Egyptians. It is an opaque variety of chalcedony.
Field identification & locations
Identify in the field by its opaque red color, smoothness, and conchoidal (shell-like) fracture patterns. It is found globally, with major deposits in India, Russia, Brazil, Germany, and the United States (Southwest region). Specimens can be found along riverbeds and in arid deserts.
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