mineral
Yellow Jasper
Silicon Dioxide (SiO2) with Iron Hydroxide inclusions
AI-generated identification · may be incorrectHardness: 6.5-7 on Mohs scale; Color: mustard yellow to brownish-yellow; Luster: waxy to dull; Crystal Structure: trigonal (microcrystalline quartz); Cleavage: none, conchoidal fracture; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- mustard yellow to brownish-yellow
- Luster
- waxy to dull
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: mustard yellow to brownish-yellow; Luster: waxy to dull; Crystal Structure: trigonal (microcrystalline quartz); Cleavage: none, conchoidal fracture; Specific Gravity: 2.58-2.91
Formation & geological history
Formed when silica-rich fluid percolates through sedimentary or volcanic rocks, depositing fine-grained quartz along with iron oxides/hydroxides (goethite) that give it the characteristic yellow color.
Uses & applications
Commonly used for lapidary work, tumbled stones, jewelry beads, carvings, and decorative landscaping rock. Also popular among crystal collectors and hobbyists.
Geological facts
Yellow jasper derives its warm earthy hue from goethite or other iron hydroxide minerals embedded within the dense microcrystalline quartz structure. It is extremely durable and takes a high polish.
Field identification & locations
Identified by its smooth texture, complete opacity, conchoidal fracture, and mustard-yellow tone often marked with thin brown or dark veinlets. Commonly found along riverbeds, beaches, and desert gravels globally.
