sedimentary
Yellow Jasper
Opaque Cryptocrystalline Quartz (SiO2)
Hardness: 6.5-7 (Mohs), Color: Yellow to ochre, Luster: Dull to vitreous, Crystal Structure: Microcrystalline, Cleavage: None, Specific Gravity: 2.6-2.9
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs), Color: Yellow to ochre, Luster: Dull to vitreous, Crystal Structure: Microcrystalline, Cleavage: None, Specific Gravity: 2.6-2.9
Formation & geological history
Formed when silica-rich fluids permeate through volcanic ash or sediment, often containing fine-grained iron inclusions like goethite which provide the yellow hue. Found in ages spanning from the Precambrian to recent periods.
Uses & applications
Used primarily for lapidary work, jewelry (cabochons), carvings, and as a collector's stone. In ancient times, it was used for seal stones and amulets.
Geological facts
Known historically as the 'rain bringer' by some Native American tribes, yellow jasper is often associated with the solar plexus and is valued for its earthy, opaque appearance.
Field identification & locations
Identified by its mustard-yellow color, extreme hardness (it will scratch glass), and smooth, conchoidal fracture patterns. Commonly found in riverbeds, deserts, and volcanic regions globally, including Egypt, Brazil, and the USA.
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