sedimentary
Jasper
Microcrystalline quartz (SiO2)
Hardness: 6.5 to 7 on the Mohs scale; Color: Yellow, brownish-yellow, red, brown, or green; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None, exhibits conchoidal fracture; Specific gravity: 2.58 to 2.91
- Hardness
- 6
- Color
- Yellow, brownish-yellow, red, brown, or green
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5 to 7 on the Mohs scale; Color: Yellow, brownish-yellow, red, brown, or green; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None, exhibits conchoidal fracture; Specific gravity: 2.58 to 2.91
Formation & geological history
Formed from silica-rich waters precipitating in sedimentary environments or hydrothermal veins, often associated with the alteration of volcanic ash or silica-rich oozes over millions of years.
Uses & applications
Used for ornamental objects, cabochons, carved gemstones, lapidary arts, and gemstone collecting.
Geological facts
Jasper has been used since ancient times for amulets, seals, and jewelry. Yellow jasper is particularly associated with grounding energy in crystal healing traditions.
Field identification & locations
Can be identified by its opaque nature, hardness (scratches glass), and smooth conchoidal fracture. Found worldwide in riverbeds, sedimentary deposits, and volcanic regions.
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