sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
Hardness: 6.5–7 on Mohs scale; Color: Brick red to brownish-red; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Microcrystalline (cryptocrystalline quartz); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91
- Hardness
- 6
- Color
- Brick red to brownish-red
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7 on Mohs scale; Color: Brick red to brownish-red; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Microcrystalline (cryptocrystalline quartz); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91
Formation & geological history
Formed through the deposition of silica-rich fluids within volcanic or sedimentary environments. Its red color is derived from high iron oxide (hematite) content. It can be found in various geological eras, commonly associated with hydrothermal veins or as nodules in sedimentary strata.
Uses & applications
Primarily used for decorative lapidary work, including jewelry (beads, cabochons), carvings, and ornamental objects. It is also a popular stone for tumbling and collecting due to its vibrant color and ability to hold a high polish.
Geological facts
Historically known as the 'nourisher' in ancient cultures, it was used by Egyptians in amulets and by Native Americans as a 'blood of the earth' stone. It is an opaque variety of chalcedony that never transmits light, unlike carnelian.
Field identification & locations
Identify in the field by its characteristic brick-red color, extreme hardness (it will scratch glass), and lack of transparency. Common locations include India, Brazil, Madagascar, and the Southwestern United States. Collectors should look for patterns of 'brecciation' or quartz veining.
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