sedimentary
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow to golden brown; Luster: Dull to vitreous; Crystal Structure: Hexagonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mustard yellow to golden brown
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow to golden brown; Luster: Dull to vitreous; Crystal Structure: Hexagonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed from the deposition of silica-rich fluids in volcanic ash or fine-grained sediments. Over time, the silica crystallizes into microcrystalline quartz, with iron inclusions providing the yellow color.
Uses & applications
Commonly used for lapidary work, jewelry (cabochons), talismans, and stone carvings.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek word 'iaspis', meaning spotted stone. It has been a popular gemstone since antiquity.
Field identification & locations
Identify in the field by its opaque nature, conchoidal fracture (curved breaks), and hardness (cannot be scratched by a steel knife). Commonly found in riverbeds or mountain ranges globally.
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