sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to brownish-orange, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (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-orange, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of fine-grained silica in sedimentary environments or hydrothermal veins. The yellow color is caused by the presence of Goethite or other iron hydroxide minerals during formation.
Uses & applications
Commonly used for lapidary work including cabochons, beads, and pocket stones. Also used in metaphysical practices as a grounding stone.
Geological facts
Jasper is an opaque variety of chalcedony. It has been used since antiquity for seals, jewelry, and ornamentation, and was frequently mentioned in various ancient cultural texts.
Field identification & locations
Identify by its opacity (even when held to light), smooth waxy feel when water-worn, and hardness. Often found in riverbeds or coastal areas as rounded pebbles. Common in India, Brazil, and the Southwestern USA.
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