sedimentary
Red Jasper
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)
Hardness: 6.5-7 on Mohs scale; Color: Deep red to brownish-red; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; SG: 2.58-2.91
- Hardness
- 6
- Color
- Deep red to brownish-red
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Deep red to brownish-red; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; SG: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from water-rich environments, specifically within hydrothermal veins or as a secondary mineral in volcanic rocks. The red color is caused by iron inclusions.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, and ornamental carvings. Also used in construction as decorative stone and popular in New Age gemstone collections.
Geological facts
Jasper is an opaque variety of chalcedony. Historically, it was known as the 'supreme nurturer' and has been used since ancient times for amulets and seals. It is a common variety of quartz.
Field identification & locations
Identify by its opaque nature (it does not let light through, unlike carnelian), its high hardness, and its characteristic dull-to-waxy luster on smooth surfaces. It is commonly found globally, notably in Brazil, India, and the USA.
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