sedimentary
Jasper with Hematite inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
Hardness: 6.5-7 (Mohs scale); Color: Ochre yellow, tan, and reddish-brown; Luster: Dull to vitreous when polished; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58–2.91
- Hardness
- 6
- Color
- Ochre yellow, tan, and reddish-brown
- Luster
- Dull to vitreous when polished
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Ochre yellow, tan, and reddish-brown; Luster: Dull to vitreous when polished; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58–2.91
Formation & geological history
Formed from the hydrothermal deposition of silica and iron oxides in volcanic or sedimentary environments. The dark reddish-brown spots are hematite or iron-rich nodules that formed within the silicate matrix.
Uses & applications
Commonly used for lapidary work, cabochons for jewelry, decorative carvings, and as a popular specimen for rock hounds and collectors.
Geological facts
Jasper is often found in large quantities and can exhibit amazing patterns due to the presence of secondary minerals like hematite or manganese. It was once highly prized by ancient civilizations for its supposed protective properties.
Field identification & locations
Identify by its hardness (will scratch glass), opaque nature, and smooth, waxy feel when polished. It is frequently found in riverbeds, glacial deposits, and dry desert washes.
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