sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness: 6.5 to 7 on the Mohs scale, Color: Brown, red, yellow, green, or multicolored, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (exhibits conchoidal fracture), Specific Gravity: 2.58 to 2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5 to 7 on the Mohs scale, Color: Brown, red, yellow, green, or multicolored, 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 by the silification of sedimentary or volcanic rocks, where silica-rich fluids precipitate in cracks or cavities, often found in ancient marine environments or hydrothermal systems spanning millions of years.
Uses & applications
Used widely in ornamental carving, jewelry, cabochons, and as a decorative stone.
Geological facts
Jasper has been used by ancient peoples for thousands of years to create tools, seals, and amulets. Its opaque nature distinguishes it from other forms of chalcedony like agate.
Field identification & locations
Identified in the field by its waxy luster, lack of cleavage, conchoidal fracture, and opaque earthy colors. Found worldwide in riverbeds, metamorphic belts, and volcanic deposits.
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