mineral
Jasper
Chalcedony (Microcrystalline Quartz) - SiO2
AI-generated identification · may be incorrectHardness: 6.5-7 on Mohs scale. Color: Red, brown, yellow, green (this specimen is predominantly red with dark inclusions). Luster: Vitreous to dull. Crystal structure: Trigonal (microcrystalline). Cleavage: None (conchoidal fracture). Specific gravity: 2.5-2.9.
- Hardness
- 6
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Red, brown, yellow, green (this specimen is predominantly red with dark inclusions). Luster: Vitreous to dull. Crystal structure: Trigonal (microcrystalline). Cleavage: None (conchoidal fracture). Specific gravity: 2.5-2.9.
Formation & geological history
Formed from silica-rich fluids in volcanic rocks or sedimentary environments. The red color is typically due to iron inclusions (hematite). Can be found in various geological ages.
Uses & applications
Commonly used as a gemstone in jewelry, for carving, ornamental objects, and as tumbled stones for collectors.
Geological facts
Jasper is an opaque variety of chalcedony. The name means 'spotted or speckled stone'. It has been used since antiquity for seals, beads, and carved amulets.
Field identification & locations
Identified by its opacity, hardness (scratches glass), and typical earthy colors. Commonly found worldwide in volcanic and sedimentary deposits. For collectors, polished stones are popular and easy to identify by their smooth finish and vibrant colors.
