sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

AI-generated identification · may be incorrect

Hardness: 6.5-7.0 (Mohs scale); Color: Mustard yellow, tan, golden-brown; Luster: Vitreous to waxy; Structure: Microcrystalline; Specific Gravity: 2.6-2.7

Hardness: 6
Color: Mustard yellow, tan, golden-brown
Luster: Vitreous to waxy

Identified May 31, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7.0 (Mohs scale); Color: Mustard yellow, tan, golden-brown; Luster: Vitreous to waxy; Structure: Microcrystalline; Specific Gravity: 2.6-2.7

Formation & geological history

Formed via the accumulation of silica-rich fluids in volcanic ash or sedimentary deposits, often during the Paleozoic or Mesozoic eras. The yellow color is derived from iron hydroxide inclusions (Goethite).

Uses & applications

Primarily used for lapidary work, decorative cabochons, metaphysical crystals, and jewelry making.

Geological facts

Jasper is an opaque variety of chalcedony. Yellow jasper was historically used by ancient civilizations as a protective amulet for travelers and shamans.

Field identification & locations

Identified by its opacity (even on thin edges), smooth conchoidal fracture, and inability to be scratched by a steel knife. Found globally, with notable deposits in South Africa, USA, and Madagascar.