sedimentary
Yellow Jasper
Silica (Silicon Dioxide, SiO2) with iron inclusions
Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mustard yellow to golden brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Forms through the hydrothermal or sedimentary deposition of silica in cracks, cavities, or as nodules. The yellow color is primarily caused by the presence of goethite or limonite (iron hydroxides).
Uses & applications
Used extensively as a lapidary material for cabochons, beads, and carvings. Also used historically for tools and currently popular in metaphysical collections.
Geological facts
Yellow Jasper is known as a stone of protection and was often worn by ancient peoples during travel. It is a variety of Chalcedony, which is a microcrystalline form of quartz.
Field identification & locations
Identified in the field by its opaque nature (unlike agate), smooth conchoidal fracture, and wax-like surface. It is commonly found in riverbeds or as nodules in volcanic or sedimentary host rocks.
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