sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
Hardness: 6.5-7 (Mohs), Color: Yellow to brownish-yellow with darker banding or patches, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None, Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs), Color: Yellow to brownish-yellow with darker banding or patches, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None, Specific Gravity: 2.58-2.91
Formation & geological history
Formed via the deposition of silica from water solutions or volcanic ash into sedimentary environments, often influenced by thermal activity that infuses iron hydroxides (Goethite) to create yellow pigments.
Uses & applications
Used primarily in jewelry as cabochons or beads, for ornamental carvings, and as a popular stone for lapidary tumbling.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'jasper' comes from the Greek word 'iaspis', meaning 'spotted stone'. It was highly favored in the ancient world for both its beauty and supposed protective properties.
Field identification & locations
Identified in the field by its opaque nature (unlike translucent agate), conchoidal fracture, and smoothness when water-worn. Commonly found in riverbeds, deserts, and volcanic regions globally.
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