Rock Identifier
Yellow Jasper (Silicon dioxide with iron inclusions (SiO2)) — mineral
mineral

Yellow Jasper

Silicon dioxide with iron inclusions (SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow, tan, golden brown; Luster: Dull to vitreous (waxy when polished); Crystal Structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91

Hardness
6
Color
Mustard yellow, tan, golden brown
Luster
Dull to vitreous (waxy when polished)
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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow, tan, golden brown; Luster: Dull to vitreous (waxy when polished); Crystal Structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91

Formation & geological history

Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments. Its yellow color is derived from iron (goethite) inclusions. Much of the world's jasper is millions of years old, often found in hydrothermal veins or as river-worn nodules.

Uses & applications

Commonly used in lapidary work for cabochons, beads, and ornamental carvings. It is also used as a decorative stone in landscaping and widely collected by rockhounds for its patterns.

Geological facts

Yellow Jasper has been used by ancient civilizations for amulets and carvings. It is famous for its 'picture' varieties where inclusions create scenes resembling landscapes. It is a dense, opaque variety of chalcedony.

Field identification & locations

Identify in the field by its opacity (will not let light through even at the edges), smooth water-worn texture on beaches/riverbeds, and its inability to be scratched by a steel knife. Common in the Pacific Northwest, Brazil, and South Africa.

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