sedimentary
Jasper (Polychrome Jasper)
Silicon Dioxide (SiO2) with various inclusions
Hardness: 6.5-7 Mohs; Color: Earthy tones including tan, red, and grey; Luster: Dull to waxy; Crystal Structure: Microcrystalline (Trigonal); Cleavage: None; Opaque.
- Hardness
- 6
- Color
- Earthy tones including tan, red, and grey
- Luster
- Dull to waxy
Identified More sedimentary →
Explore Jasper (Polychrome Jasper) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5-7 Mohs; Color: Earthy tones including tan, red, and grey; Luster: Dull to waxy; Crystal Structure: Microcrystalline (Trigonal); Cleavage: None; Opaque.
Formation & geological history
Formed when silica-rich fluids permeate porous sedimentary or volcanic rock, taking on pigment from mineral impurities like iron and manganese over millions of years. This specimen appears water-worn or tumbled.
Uses & applications
Used primarily in jewelry, lapidary arts, decorative items, and as a healing or meditation stone in metaphysical circles.
Geological facts
The name 'Jasper' is derived from the Greek word 'iaspis', meaning 'spotted stone'. This specific earthy variety is often called Polychrome or Desert Jasper when it displays multi-colored, desert-like banding.
Field identification & locations
Identify by its smooth, waxy feel, hardness (it will scratch glass), and its lack of transparency even on thin edges. Commonly found in riverbeds or arid desert regions worldwide, notably Madagascar.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
sedimentary
Brown Sandstone (River Rock)
Arenite
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary