sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to brownish-gold, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to brownish-gold, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.58-2.91
Formation & geological history
Formed from silica-rich fluids depositing in cracks and voids of volcanic or sedimentary rocks, often enriched with iron minerals that provide the yellow pigment.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, jewelry, and as a decorative architectural stone or tumble stone.
Geological facts
Jasper is an opaque variety of chalcedony. Historically, it has been used for millennia for seals and ornamentation; it is mentioned in several ancient cultural and religious texts.
Field identification & locations
Identify by its waxy luster, opacity (unlike citrine which is translucent), and its inability to be scratched by a steel knife. Frequently found in riverbeds and coastal regions globally.
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