sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
Hardness: 6.5-7 (Mohs); Color: Red-brown, ochre, brown; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Red-brown, ochre, brown
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Red-brown, ochre, brown; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich fluids in volcanic or sedimentary environments, often involving the replacement of organic materials or minerals by silica over millions of years.
Uses & applications
Used primarily in lapidary work, jewelry (beads, cabochons), landscaping, and as a semi-precious collector's stone.
Geological facts
Jasper has been used throughout history as a sacred stone; it was used in ancient times to create cylinders for seals and in the breastplate of the Jewish high priest.
Field identification & locations
Identify by its waxy-to-dull luster, opacity (even at thin edges), and conchoidal fracture. Common in gravel beds and around volcanic deposits.
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