sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions
Hardness: 6.5-7 Mohs; Color: Mustard yellow, tan, or gold with brown veins; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (Conchoidal fracture)
- Hardness
- 6
- Color
- Mustard yellow, tan, or gold with brown veins
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Mustard yellow, tan, or gold with brown veins; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (Conchoidal fracture)
Formation & geological history
Formed through the deposition of silica from water or volcanic ash, often in coastal or sedimentary environments where iron oxides (goethite) permeate the silica to provide color.
Uses & applications
Used primarily in lapidary work for cabochons, beads, and ornamental carvings. Also valued as a healing stone in metaphysical communities.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'jasper' comes from the Greek 'iaspis', meaning 'spotted stone'. Yellow jasper specifically owes its color to hydrated iron oxide.
Field identification & locations
Identify in the field by its opacity (even when held to light), high hardness (won't scratch with a steel knife), and smooth, waxy surface when water-worn in riverbeds or beaches.
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