sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Yellow to brownish-yellow; Luster: Vitreous to waxy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Yellow to brownish-yellow
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Yellow to brownish-yellow; Luster: Vitreous to waxy; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Forms when silica-rich fluids permeate through volcanic ash or sedimentary rocks, often during low-temperature hydrothermal processes or by the accumulation of secondary minerals in cracks and cavities.
Uses & applications
Used primarily in jewelry (cabochons, beads), decorative carvings, lapidary arts, and as a popular stone for mineral collectors and metaphysical practitioners.
Geological facts
The yellow color in this variety of Jasper is caused by high concentrations of iron oxide minerals like goethite or limonite. Historically, Jasper was a favorite gemstone in the ancient world, mentioned in biblical texts and used for seals.
Field identification & locations
Identify by its opaque nature (unlike agate), its hardness (will scratch glass), and its characteristic smooth, waxy feel when polished. Commonly found in large deposits in India, Russia, Brazil, and the USA.
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