sedimentary
Jasper
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness: 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
Identified More sedimentary →
Explore Jasper in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
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.
More like this
Other sedimentary specimens
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary