sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Yellow, mustard, ochre; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Yellow, mustard, ochre
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Yellow, mustard, ochre; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich fluids in volcanic or sedimentary environments. Its yellow color is derived from high iron content. These formations can be millions of years old.
Uses & applications
Used primarily in jewelry, lapidary arts for cabochons and tumbled stones, and as a decorative stone in spiritual or metaphysical practices.
Geological facts
Jasper is an opaque variety of chalcedony. Historically, it was known as a stone of endurance and protection. The name means 'spotted or speckled stone'.
Field identification & locations
Identify by its opacity (it does not transmit light even on thin edges), its yellow-to-brown earthy tone, and its high hardness which prevents scratching by steel blades. Commonly found in riverbeds or coastal areas.
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