sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite)
Hardness: 6.5 - 7 (Mohs scale), Color: Mustard yellow to brownish-yellow, Luster: Dull to waxy, Crystal Structure: Trigonal/Microcrystalline, Cleavage: None/Conchoidal fracture, Specific Gravity: 2.58 - 2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5 - 7 (Mohs scale), Color: Mustard yellow to brownish-yellow, Luster: Dull to waxy, Crystal Structure: Trigonal/Microcrystalline, Cleavage: None/Conchoidal fracture, Specific Gravity: 2.58 - 2.91
Formation & geological history
Formed from the deposition of microcrystalline silica in hydrothermal veins or from the consolidation of volcanic ash and radiolarian ooze. It can range from Precambrian to recent geological ages.
Uses & applications
Used primarily for lapidary work, jewelry (cabochons), interior decoration, and as a popular specimen for rock collectors and practitioners of crystal healing.
Geological facts
Jasper is an opaque variety of chalcedony. The yellow hue is almost entirely due to the presence of goethite (iron) impurities that integrated during the formation process. Many ancient civilizations used yellow jasper as an amulet of protection.
Field identification & locations
Identify in the field by its hardness (it can scratch glass), its opaque nature, and its typical conchoidal (shell-like) fracture. Found commonly in riverbeds and arid regions in countries like India, Russia, and the USA.
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