sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness: 6.5-7 on the Mohs scale. Color: Red, brown, yellow, green, or multicolored. Luster: Vitreous to dull. Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz). Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Red, brown, yellow, green, or multicolored
- 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: Red, brown, yellow, green, or multicolored. Luster: Vitreous to dull. Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz). Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.58-2.91.
Formation & geological history
Formed from silica-rich solutions in sedimentary environments or hydrothermal veins, often originating from silica precipitates or altered volcanic ash. Can be billions of years old.
Uses & applications
Used in ornamental objects, cabochons for jewelry, carvings, and as a popular specimen for rock collectors and lapidary work.
Geological facts
Jasper has been used throughout human history since ancient times for talismans, seals, and weaponry like arrowheads due to its toughness and ability to take a high polish.
Field identification & locations
Identify by its opaque nature, waxy luster, conchoidal fracture, and vibrant earthy colors. Commonly found worldwide in riverbeds, glacial tills, and weathered outcroppings.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Banded Siltstone / Mudstone Pebble
Siltstone / Argillite
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary