sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to gold, Luster: Vitreous to waxy, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None (Conchoidal fracture), Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to gold, Luster: Vitreous to waxy, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None (Conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of fine silica sediments or volcanic ash that undergoes mineralization. The yellow color is primarily caused by goethite or limonite inclusions.
Uses & applications
Used primarily in lapidary work for jewelry, cabochons, and decorative ornamental carvings. Also popular among crystal collectors and metaphysical practitioners.
Geological facts
Jasper is a variety of chalcedony. Historically, yellow jasper was known as a stone of protection and was often used by travelers for safety on long journeys.
Field identification & locations
Identify by its opaque nature (unlike yellow quartz or citrine which are translucent), conchoidal fracture, and smooth handle when tumbled. Often found in riverbeds or coastal deposits.
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