mineral
Jasper
SiO2
AI-generated identification · may be incorrectHardness 6.5-7 on Mohs scale. Opaque variety of chalcedony. Often red, yellow, brown, or green in color due to mineral impurities (like iron oxides). Luster is vitreous to greasy. Microcrystalline quartz structure.
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Physical properties
Hardness 6.5-7 on Mohs scale. Opaque variety of chalcedony. Often red, yellow, brown, or green in color due to mineral impurities (like iron oxides). Luster is vitreous to greasy. Microcrystalline quartz structure.
Formation & geological history
Forms in hydrothermal veins, volcanic rocks, and sedimentary deposits as silica-rich fluids precipitate and replace other materials over time.
Uses & applications
Used primarily as a gemstone, in lapidary arts, and for ornamental carvings. Often tumbled or polished for jewelry and collecting.
Geological facts
The name means 'spotted or speckled stone'. Jasper was a favorite gem in ancient times, used for seals, amulets, and decorative items.
Field identification & locations
Identify by its hardness (scratches glass), opacity (unlike agate which is often translucent), and varied, earthy colors. Common globally in volcanic and sedimentary environments.
