sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with goethite or limonite inclusions
Hardness: 6.5-7 (Mohs); Color: Mustard yellow to brownish-yellow; Luster: Dull to Vitreous/Waxy; Structure: Cryptocrystalline; Cleavage: None; SG: 2.6-2.9
- Hardness
- 6
- Color
- Mustard yellow to brownish-yellow
- Luster
- Dull to Vitreous/Waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Mustard yellow to brownish-yellow; Luster: Dull to Vitreous/Waxy; Structure: Cryptocrystalline; Cleavage: None; SG: 2.6-2.9
Formation & geological history
Formed through the deposition of silica from water-rich environments or volcanic ash. The yellow hue is produced by iron-rich hydrates (limonite/goethite) during the mineralization process over millions of years.
Uses & applications
Predominantly used as an ornamental gemstone, for lapidary work (cabochons), jewelry, and as a popular focus in spiritual or metaphysical practices.
Geological facts
Jasper is an opaque variety of chalcedony. Historically, it was known as the 'Rain Bringer' in Native American traditions and was often used to protect travelers.
Field identification & locations
Identify by its opaque quality (light won't pass through even thin edges), yellow/gold earthy tones, and smooth, conchoidal fracture. Commonly found in South Africa, Brazil, and the Western USA.
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