sedimentary
Yellow Jasper
Jasper (Silica-rich Microcrystalline Quartz, SiO2)
Hardness: 6.5–7 (Mohs scale); Color: Yellow to brownish-yellow due to iron inclusions; Luster: Dull to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91.
- Hardness
- 6
- Color
- Yellow to brownish-yellow due to iron inclusions
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5–7 (Mohs scale); Color: Yellow to brownish-yellow due to iron inclusions; Luster: Dull to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91.
Formation & geological history
Formed from the deposition of silica from mineral-rich fluids in cavities or volcanic ash, often associated with sedimentary and metamorphic environments. Most deposits range from the Precambrian to Cenozoic eras.
Uses & applications
Commonly used for lapidary work, jewelry (cabochons and beads), decorative ornaments, and as a popular 'healing stone' in metaphysical communities.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek word 'iaspis,' meaning spotted stone, referencing its often multi-colored or patterned appearance.
Field identification & locations
Identify in the field by its opacity (unlike translucent carnelian), hardness (it will scratch glass), and waxy feel when smoothed by river water. Commonly found in riverbeds and gravel deposits worldwide.
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