sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
Hardness: 6.5-7 (Mohs scale); Color: Yellow to brownish-yellow; Luster: Dull to vitreous/waxy; Crystal Structure: Hexagonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.6-2.9
- Hardness
- 6
- Color
- Yellow to brownish-yellow
- Luster
- Dull to vitreous/waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Yellow to brownish-yellow; Luster: Dull to vitreous/waxy; Crystal Structure: Hexagonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.6-2.9
Formation & geological history
Formed from silica-rich fluids precipitating in voids within sedimentary or volcanic rocks. The yellow color is primarily due to the presence of goethite or other iron oxides during formation.
Uses & applications
Used primarily for lapidary work, jewelry (cabs or beads), meditation stones, and as a decorative landscaping rock when found in large quantities.
Geological facts
Jasper is an opaque variety of chalcedony. Historically, it was known as a stone of protection and was often used in amulets by ancient civilizations.
Field identification & locations
Identify in the field by its smooth, water-worn texture when found in riverbeds, its high hardness (doesn't scratch with a knife), and opaque nature. It is common in riverbeds and coastal areas globally.
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