sedimentary
Jasper and Agate (Polychrome Jasper / Mookaite variety)
Silicon dioxide (SiO2) microcrystalline quartz
Hardness: 6.5 to 7 on the Mohs scale. Color: Multicolored with red, brown, yellow, and white banding. Luster: Vitreous to waxy. Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz). Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.60 to 2.65.
- Hardness
- 6
- Color
- Multicolored with red, brown, yellow, and white banding
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5 to 7 on the Mohs scale. Color: Multicolored with red, brown, yellow, and white banding. Luster: Vitreous to waxy. Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz). Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.60 to 2.65.
Formation & geological history
Formed through the deposition of silica-rich fluids in rock cavities, fractures, or sedimentary environments over millions of years, often associated with volcanic activity or hydrothermal processes.
Uses & applications
Widely used in lapidary arts for making cabochons, beads, decorative carvings, ornamental objects, and jewelry.
Geological facts
Jasper varieties often contain up to 20% foreign materials, which account for the wide variety of vibrant colors and intricate patterns found in individual specimens.
Field identification & locations
Can be identified by its conchoidal fracture, lack of cleavage, high hardness (scratches glass), and waxy luster. Commonly found in riverbeds, desert areas, and regions with ancient volcanic or sedimentary activity. Popular among rockhounds and lapidary hobbyists.
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