sedimentary
Red Jasper
Silicon Dioxide (SiO2)
Hardness: 6.5-7 Mohs; Color: Opaque Brick-Red; Luster: Vitreous to dull; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Opaque Brick-Red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 Mohs; Color: Opaque Brick-Red; Luster: Vitreous to dull; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed from silica-rich groundwater circulating through volcanic or sedimentary ash layers, where iron oxides (hematite) provide the red pigmentation. It is found in deposits ranging from Precambrian to recent ages.
Uses & applications
Used primarily in lapidary arts, jewelry (beads, cabochons), ornamental vases, and as a popular stone for tumbling and meditation collections.
Geological facts
The name Jasper comes from the Greek word 'iaspis', meaning 'spotted stone'. In ancient civilizations, it was known as the 'supreme nurturer' and was used for amulets and seals.
Field identification & locations
Identify by its solid red color, high hardness (cannot be scratched by a steel nail), and smooth, waxy surface when polished. Commonly found in India, Brazil, Egypt, and the southwestern USA.
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