sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Yellow to mustard brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Yellow to mustard brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Yellow to mustard brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed from silica-rich groundwater percolating through sedimentary or volcanic rocks. The yellow color is primarily due to goethite or other iron hydroxide inclusions. It can form in various geological timeframes from Precambrian to recent.
Uses & applications
Used primarily for ornamental purposes, jewelry (cabochons, beads), decorative carvings, and lapidary art. It's also popular in the metaphysical/collecting community.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'jasper' comes from the Greek 'iaspis', meaning 'spotted stone.' Yellow Jasper was historically used by ancient civilizations as a stone of protection for travelers.
Field identification & locations
Identify by its opacity (unlike translucent citrine), conchoidal fracture when broken, and dull waxy surface when unpolished. Found globally with major deposits in India, Russia, Brazil, and the USA. It is often discovered as water-worn pebbles in riverbeds.
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