sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
Hardness: 6.5-7 (Mohs); Color: Mustard yellow, golden brown; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (microcrystalline); Cleavage: None; Specific Gravity: 2.6-2.9
- 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; Crystal Structure: Hexagonal (microcrystalline); Cleavage: None; Specific Gravity: 2.6-2.9
Formation & geological history
Formed from the deposition of silica-rich fluids in sedimentary or volcanic environments. Its yellow color is derived from iron (goethite) inclusions during the solidification process.
Uses & applications
Used primarily for lapidary arts, jewelry making (cabochons and beads), decorative ornaments, and as a popular stone in crystal healing practices.
Geological facts
Jasper is an opaque variety of chalcedony. Historically, it was known as a 'nurturing stone' and was often used in ancient amulets for protection and strength.
Field identification & locations
Identify by its opacity (even on thin edges), smooth waxy feel when polished, and lack of visible crystalline grain. Commonly found in riverbeds or coastal deposits globally.
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