mineral
Jasper
Silicon Dioxide (SiO2)
Hardness: 6.5-7 on Mohs scale. Color: Brownish-yellow to reddish-brown, opaque. Luster: Waxy to vitreous. Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz). Cleavage: None, exhibits conchoidal fracture.
- Hardness
- 6
- Color
- Brownish-yellow to reddish-brown, opaque
- Luster
- Waxy to vitreous
Identified More mineral →
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 Mohs scale. Color: Brownish-yellow to reddish-brown, opaque. Luster: Waxy to vitreous. Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz). Cleavage: None, exhibits conchoidal fracture.
Formation & geological history
Formed through the deposition of silica-rich microcrystalline fluids filling cavities, veins, or sedimentary layers, often colored by iron oxides and hydroxides.
Uses & applications
Used primarily for lapidary work, decorative carvings, cabochons in jewelry, tumbling, and rock collecting.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'jasper' comes from the Greek word 'iaspis', meaning 'spotted stone'. Brown and yellow varieties are heavily colored by iron oxide minerals like goethite and limonite.
Field identification & locations
Field identification features include its smooth, waxy feel, conchoidal fracture, complete opacity, and inability to be scratched by steel. Commonly found in riverbeds, gravel deposits, and volcanic regions worldwide.
More like this
Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock