sedimentary
Yellow Jasper (within host rock)
Silicon Dioxide (SiO2) with iron hydroxides (Goethite)
Hardness: 6.5-7 (Mohs scale); Color: Yellow to mustard-gold; Luster: Waxy to dull; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Yellow to mustard-gold
- Luster
- Waxy to dull
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Yellow to mustard-gold; Luster: Waxy to dull; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich fluids within volcanic ash beds or sedimentary veins. The yellow color is caused by the inclusion of iron oxide minerals. These specimens are often found in areas with ancient volcanic activity and silicate-rich groundwater.
Uses & applications
Commonly used for lapidary work, cabochons, and jewelry making. In industry, high-purity jasper can be used as an abrasive or as a decorative stone in architectural accents.
Geological facts
Jasper is a variety of chalcedony that is opaque due to its high mineral inclusion content. Legend states that yellow jasper was once used as a protective talisman for spiritual travelers and as a 'stone of endurance.'
Field identification & locations
Identify in the field by its smooth, waxy interior compared to the rough outer rind (matrix), its high hardness (won't be scratched by a steel knife), and its characteristic shell-like fracture pattern. Common in the Western USA, Madagascar, and Russia.
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