sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Red, terracotta; Luster: Dull to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Red, terracotta
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Red, terracotta; Luster: Dull to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed from silica-rich fluids that deposit microcrystalline quartz in coastal environments or through hydrothermal processes. The red color comes from iron oxide (hematite) impurities included during formation.
Uses & applications
Used primarily in jewelry (cabochons, beads), decorative carvings, and as a healing stone in holistic practices. Historically used for making tools and seals.
Geological facts
The name Jasper comes from the Greek word 'iaspis', meaning 'spotted stone'. It is one of the traditional birthstones for March and has been found in ancient archaeological sites dating back over 5,000 years.
Field identification & locations
Identify in the field by its deep red color, high hardness (cannot be scratched by a steel knife), and its characteristic smooth, waxy feel when polished naturally by water. Commonly found in riverbeds and coastlines.
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