sedimentary
Yellow Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions), SiO2
Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow, golden brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58–2.91
- Hardness
- 6
- Color
- Mustard yellow, golden brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow, golden brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58–2.91
Formation & geological history
Formed from the deposition of silica from water solutions into cavities or as replacement minerals in sedimentary or volcanic environments. The yellow color is primarily due to goethite or other iron hydroxide inclusions.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, and decorative carvings. It is also popular in holistic practices and as a collector's specimen.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek 'iaspis', meaning 'spotted stone'. In ancient times, it was considered a 'rain bringer' and a stone of protection for travelers.
Field identification & locations
Identify in the field by its opacity (unlike transcluent agate), smooth conchoidal fracture, and inability to be scratched by a steel knife. It is commonly found in river beds or areas with volcanic activity.
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