Sedimentary / Mineral
Jasper
Silicon dioxide (SiO2)
Hardness: 6.5-7, Color: Red (due to iron inclusions), Luster: Vitreous to dull, Crystal structure: Microcrystalline quartz (chalcedony), Cleavage: None, Specific gravity: 2.5-2.9
- Hardness
- 6
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Physical properties
Hardness: 6.5-7, Color: Red (due to iron inclusions), Luster: Vitreous to dull, Crystal structure: Microcrystalline quartz (chalcedony), Cleavage: None, Specific gravity: 2.5-2.9
Formation & geological history
Formed from silica-rich fluids that percolate through rocks and deposit silica, often in sedimentary environments or as volcanic replacements. Age can vary widely.
Uses & applications
Used as a gemstone, for ornamental purposes, in lapidary arts, and historically for tools and weapons.
Geological facts
Jasper is an opaque variety of chalcedony. The red color in this specimen is typical of 'red jasper' and is caused by iron(III) inclusions.
Field identification & locations
Can be identified by its opacity, red color, hardness (scratches glass), and conchoidal fracture. Commonly found worldwide. Easy to collect for beginners.
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