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), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
- 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: 6.5-7 on the Mohs scale, Color: Red, brown, yellow, green, or multicolored, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often replacing organic material or filling cavities in volcanic rocks.
Uses & applications
Used for ornamental objects, cabochons, jewelry, carvings, and as a collector's specimen.
Geological facts
Red jasper gets its characteristic crimson color from iron oxide inclusions. It has been used since ancient times for amulets, seals, and weaponry.
Field identification & locations
Easily identified by its opaque nature, conchoidal fracture, and hard, waxy to dull luster. Found worldwide, particularly in regions with ancient volcanic or sedimentary activity.
More like this
Other sedimentary specimens
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
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