sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides
Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow to golden brown; Luster: Vitreous to dull; Structure: Microcrystalline quartz; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Mustard yellow to golden brown
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow to golden brown; Luster: Vitreous to dull; Structure: Microcrystalline quartz; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91.
Formation & geological history
Formed in hydrothermal environments or primarily in sedimentary deposits where silica-rich waters permeate volcanic or sedimentary rocks, often enriched with iron minerals like goethite or limonite over millions of years.
Uses & applications
Used extensively in jewelry, lapidary arts for cabochons and beads, ornamental carvings, and as a popular grounding stone in metaphysical collecting.
Geological facts
Yellow Jasper is often found in river beds as water-worn pebbles. Historically, it has been used as a 'nurturing' stone across various cultures and is prized for its ability to take a very high polish.
Field identification & locations
Identify in the field by its opaque nature, smooth waxy feel when wet, and superior hardness (it will scratch glass). Commonly found in the deserts of the Southwest USA, India, and Madagascar.
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