sedimentary
Jasper
Microcrystalline quartz (SiO2)
Hardness: 6.5-7 on the Mohs scale; Color: Brown, tan, yellow, red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None, exhibits conchoidal fracture; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brown, tan, yellow, red
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 on the Mohs scale; Color: Brown, tan, yellow, red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None, exhibits conchoidal fracture; Specific gravity: 2.58-2.91
Formation & geological history
Formed through the precipitation of silica-rich solutions in sedimentary environments or hydrothermal veins, often replacing organic material or filling cavities in volcanic rocks.
Uses & applications
Used primarily in jewelry, cabochons, decorative ornaments, and as a collector's gemstone.
Geological facts
Jasper has been used since ancient times for seals, talismans, and jewelry, with mentions dating back to antiquity across various cultures.
Field identification & locations
Identified by its opaque appearance, hardness scratching glass, and smooth conchoidal fracture. Found worldwide in regions with past volcanic or sedimentary activity.
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