sedimentary
Jasper
Cryptocrystalline Quartz (SiO2)
Hardness: 6.5-7 Mohs scale; Color: typically yellow, tan, or brown with dark inclusions; Luster: Vitreous to dull; Crystal structure: Trigonal (microscopic); Cleavage: None; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- typically yellow, tan, or brown with dark inclusions
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 Mohs scale; Color: typically yellow, tan, or brown with dark inclusions; Luster: Vitreous to dull; Crystal structure: Trigonal (microscopic); Cleavage: None; Specific gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from mineral-filled fluids in pockets of volcanic rock or sedimentary beds. Geological age varies widely from Precambrian to Cenozoic eras.
Uses & applications
Commonly used as a gemstone for cabochons, beads, and decorative ornaments. Historically used for making tools and seals.
Geological facts
Jasper is an impure variety of silica. The name 'jasper' means 'spotted or speckled stone' and it has been used by civilizations dating back to the Indus Valley Civilization.
Field identification & locations
Identify by its waxy or dull appearance, conchoidal fracture, and inability to be scratched by a steel pocket knife. Found globally in riverbeds, deserts, and coastal areas.
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