sedimentary
Red Jasper
SiO2 (Silicon Dioxide) with Fe2O3 (Hematite)
Hardness: 6.5-7 on Mohs scale; Color: Brick red to brownish red; Luster: Vitreous to waxy (after polishing); Structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brick red to brownish red
- Luster
- Vitreous to waxy (after polishing)
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Brick red to brownish red; Luster: Vitreous to waxy (after polishing); Structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Red Jasper is a microcrystalline variety of quartz. It forms through the infiltration of silica-rich fluids into volcanic or sedimentary rocks, where hematite inclusions provide the deep red color. It is often found in banded iron formations or as secondary deposits.
Uses & applications
Primarily used for lapidary work, including jewelry (cabochons and beads), decorative ornaments, and tumbled stones for collecting and metaphysical use. Historically used for seals and amulets.
Geological facts
Known as the 'Stone of Endurance' or 'the blood of Mother Earth' in various cultures. In Ancient Egypt, it was associated with the fertilizing blood of the goddess Isis. It is exceptionally opaque compared to other chalcedony varieties.
Field identification & locations
Identify by its rich, opaque red color and high hardness (it will scratch glass). It is commonly found in India, Brazil, South Africa, and the southwestern United States. Look for intense uniform color or fine banding in field specimens.
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