sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Hardness: 6.5–7 on the Mohs scale; Color: Deep brick red with dark grey or black veins; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline quartz); Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.91
- Hardness
- 6
- Color
- Deep brick red with dark grey or black veins
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5–7 on the Mohs scale; Color: Deep brick red with dark grey or black veins; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline quartz); Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.91
Formation & geological history
Formed through the deposition of silica-rich fluids in volcanic ash or fine-grained sediments. Over millions of years, the silica crystallizes into microcrystalline quartz. The red color is derived from high concentrations of iron oxide (hematite) during formation.
Uses & applications
Predominantly used for ornamental purposes, lapidary arts, jewelry (cabochons and beads), and as a popular specimen for collectors and practitioners of holistic therapy.
Geological facts
Jasper has been used as a gemstone since antiquity; it was mentioned in many ancient texts and used by early civilizations for cylinder seals and amulets. It is often referred to as the 'Stone of Endurance' or 'Supreme Nurturer' in metaphysical circles.
Field identification & locations
Identify in the field by its intense red opaque color, lack of transparency when held to light, and its ability to scratch glass. It is commonly found in India, Brazil, Madagascar, and the Southwestern United States (specifically Oregon and Idaho). Collectors should look for smoothness and the absence of large cracks.
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