sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
Hardness: 6.5-7 (Mohs scale); Color: Opaque brick-red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Opaque brick-red to brownish-red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Opaque brick-red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.58-2.91
Formation & geological history
Formed via the deposition of silica from water or volcanic ash into sedimentary environments or during hydrothermal activity. The red coloration is caused by high concentrations of iron oxide (hematite) inclusions within the quartz matrix.
Uses & applications
Commonly used in lapidary work for cabochons, beads, and carvings. It is also utilized in jewelry, interior design accents, and is highly popular in metaphysical or rock-collecting communities.
Geological facts
Jasper was a favorite gem in the ancient world; its name can be traced back in Arabic, Persian, Hebrew, Assyrian, Greek, and Latin. It is known as the 'Supreme Nurturer' in folklore and was often used for seals and amulets in ancient Mesopotamia.
Field identification & locations
Identify by its opaque nature (unlike carnelian which is translucent), its smooth conchoidal fracture, and inability to be scratched by a steel knife. It is found globally, with major deposits in India, Brazil, Madagascar, and the Southwestern USA.
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