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); 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); Specific Gravity: 2.58–2.91
Formation & geological history
Formed through the infiltration of silica-rich waters into sedimentary or volcanic rocks. The distinctive yellow color comes from iron-based mineral inclusions such as goethite or limonite.
Uses & applications
Commonly used for lapidary work, jewelry (cabochons), talismans, and ornamental carvings.
Geological facts
Jasper is an opaque variety of chalcedony. In ancient times, yellow jasper was often associated with solar energy and was thought to provide protection to travelers.
Field identification & locations
Identify in the field by its opacity, conchoidal fracture, and inability to be scratched by a steel knife. It is frequently found as water-worn pebbles in riverbeds or beaches.
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