sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite inclusions
Hardness: 6.5-7 (Mohs); Color: Yellow to mustard-gold; Luster: Dull to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.7
- Hardness
- 6
- Color
- Yellow to mustard-gold
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Yellow to mustard-gold; Luster: Dull to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the accumulation of fine-grained silica in hydrothermal vents or as sedimentary deposits. The yellow coloring is due to the presence of goethite or other iron oxides. Often found in Precambrian formations.
Uses & applications
Commonly used in lapidary for carvings, cabochons for jewelry, tumbled stones, and as decorative landscaping rock. Also popular in metaphysical collections.
Geological facts
Yellow jasper was historically used by ancient civilizations as a protective stone. It is a variety of chalcedony that is opaque due to high mineral impurities.
Field identification & locations
Look for a smooth, waxy feel and sharp conchoidal (shell-like) fractures. It will not be scratched by a steel knife. Abundant in locations like Brazil, Madagascar, and the Western United States.
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