sedimentary
Jasper
Microcrystalline Quartz (SiO2) with impurities
AI-generated identification · may be incorrectHardness: 6.5-7 on the Mohs scale; Color: Brown, yellow, red, orange, and black dendrites; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Brown, yellow, red, orange, and black dendrites
- Luster
- Vitreous to dull
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: 6.5-7 on the Mohs scale; Color: Brown, yellow, red, orange, and black dendrites; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed through the silification of sedimentary or volcanic rocks, where silica-rich fluids precipitate microcrystalline quartz in cavities or fractures, often over millions of years.
Uses & applications
Used in ornamental objects, cabochons for jewelry, carvings, and as a collector's specimen.
Geological facts
Jasper has been used since ancient times for amulets, seals, and tools. The dendritic patterns are often caused by inclusions of iron or manganese oxides.
Field identification & locations
Easily identified by its opaque nature, hardness, waxy luster, and conchoidal fracture. Commonly found in riverbeds, glacial tills, and areas of ancient volcanic or hydrothermal activity.
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