sedimentary (microcrystalline silicate)
Yellow Jasper
Silicon Dioxide (SiO2)
Hardness: 6.5 - 7 on Mohs scale; Color: mustard yellow to pale tan; Luster: dull to vitreous; Crystal structure: trigonal/microcrystalline; Cleavage: none (conchoidal fracture); Specific gravity: 2.58 - 2.91
- Hardness
- 6
- Color
- mustard yellow to pale tan
- Luster
- dull to vitreous
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5 - 7 on Mohs scale; Color: mustard yellow to pale tan; Luster: dull to vitreous; Crystal structure: trigonal/microcrystalline; Cleavage: none (conchoidal fracture); Specific gravity: 2.58 - 2.91
Formation & geological history
Formed from the deposition of silica-rich groundwater into cracks and cavities within other rocks or from consolidated volcanic ash. The yellow color results from high concentrations of goethite or iron oxide (limonite) during the petrification process.
Uses & applications
Used primarily as decorative gemstones, lapidary cabochons, metaphysical 'healing' stones, and historically as durable material for tools like scrapers and arrowheads because of its hardness.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone'. It was considered a sacred stone by Native American cultures, often associated with protection and grounding.
Field identification & locations
Identify by its opacity (it does not transmit light even if thinly sliced), smooth waxy feel when polished, and pitted surface when found as a water-worn river pebble. Common in desert regions and riverbeds globally.
More like this
Other sedimentary (microcrystalline silicate) specimens
Red Jasper (River-worn Pebble)
Silicon Dioxide (SiO2) with Ferric Iron inclusions
sedimentary (microcrystalline silicate)
Jasper (likely river-tumbled)
Jasper (Silica/Silicon Dioxide, SiO2)
sedimentary (microcrystalline silicate)
Jasper
Jasper (Silicate - SiO2)
sedimentary
Jasper (Liver Jasper or Chocolate Jasper)
Jasper (Silicate - SiO2)
sedimentary
Bamboo Leaf Jasper
Silicified Siltstone or Jasper (SiO2)
sedimentary
Chert with Asphaltum (or Tar)
Silica (SiO2) with natural Bitumen/Asphaltum
sedimentary