sedimentary
Yellow Jasper
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 Mohs; Color: Yellow-olive, mustard; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (microcrystalline/cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Yellow-olive, mustard
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Yellow-olive, mustard; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (microcrystalline/cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed via the accumulation of silica from ash or volcanic sediment in hydrothermal environments; the yellow color is caused by iron (goethite) inclusions.
Uses & applications
Commonly used for lapidary work, decorative cabochons, metaphysical crystals, and landscaping ornamentation.
Geological facts
Jasper is an opaque variety of chalcedony. It has been used since antiquity for royal seals and amulets, often associated with protection and stability.
Field identification & locations
Identify by its opacity (it will not let light through like agate), waxy appearance when wet, and smooth conchoidal fracture. Found frequently in riverbeds and coastal areas.
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