sedimentary
Yellow Jasper
Silicon Dioxide (SiO2)
Hardness: 6.5-7 (Mohs); Color: Mustard yellow, golden brown; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Opaque.
- Hardness
- 6
- Color
- Mustard yellow, golden brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Mustard yellow, golden brown; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Opaque.
Formation & geological history
Formed from fine-grained silica-rich sediments or volcanic ash that undergo lithification. Iron impurities provide the yellow coloration over millions of years.
Uses & applications
Used primarily for jewelry, lapidary arts, decorative items, and as a tumbling stone for collectors and metaphysical practitioners.
Geological facts
Jasper is an opaque variety of chalcedony. Historically, yellow jasper was used as a stone of protection for travelers and was highly valued in ancient civilizations for its earthy tones.
Field identification & locations
Look for its characteristic opacity (will not let light through even at edges) and smooth, waxy surface when polished. Commonly found in riverbeds or desert regions globally.
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