sedimentary
Jasper with Hematite inclusions
Silicon Dioxide (SiO2) with Fe2O3
Hardness: 6.5-7 (Mohs); Color: Reddish-brown, cream, and black; Luster: Vitreous to dull; Crystal Structure: Microcrystalline; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Reddish-brown, cream, and black
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Reddish-brown, cream, and black; Luster: Vitreous to dull; Crystal Structure: Microcrystalline; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica in groundwater within sedimentary or volcanic ash beds. The reddish and dark colors are results of iron-oxide (Hematite) and manganese inclusions. Found across various geological ages from Precambrian to Cenozoic.
Uses & applications
Commonly used in lapidary work for cabochons, beads, and pocket stones. Also used in small-scale ornamental carvings and as a collector specimen due to its unique patterns.
Geological facts
Jasper is an opaque variety of chalcedony. Historically, it was known as the 'supreme nurturer' in ancient cultures and was often used in amulets and cylinder seals in Mesopotamia.
Field identification & locations
Identify in the field by its smooth, waxy surface and its inability to be scratched by a steel knife. Commonly found in riverbeds, desert pavements, and coastal regions globally. Look for heavy, dense stones with no transparency even when held to light.
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