sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions
Hardness: 6.5-7 (Mohs), Color: mustard yellow to honey gold, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.6-2.9
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs), Color: mustard yellow to honey gold, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.6-2.9
Formation & geological history
Formed through the accumulation of silica from either volcanic ash or hydro-thermal solutions that fill cracks and cavities in rocks. The yellow coloration comes from high iron content, specifically limonite or goethite, during the silica precipitation process.
Uses & applications
Used primarily in lapidary arts for making cabochons, beads, and decorative carvings. It is also popular in metaphysical circles and as a collector's tumbled stone.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone'. In ancient times, yellow jasper was considered a stone of protection for travelers.
Field identification & locations
Identify by its complete opacity (unlike citrine which is translucent) and its smooth, waxy surface when polished. Commonly found in South Africa, Brazil, and the USA. It will easily scratch glass but cannot be scratched by a steel knife.
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