sedimentary

Yellow Jasper

Chalcedony (Silicon Dioxide with iron inclusions), SiO2

Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow with brown dendritic or veined inclusions; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.9

Hardness: 6
Color: Mustard yellow with brown dendritic or veined inclusions
Luster: Vitreous to waxy

Identified March 14, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich fluids within sedimentary rocks or volcanic ash. The yellow color is derived from high iron content (goethite/limonite). Specimens vary in age from millions to hundreds of millions of years old.

Uses & applications

Primarily used for lapidary work, jewelry (cabochons and beads), ornamental objects, and as a pocket stone for metaphysical collecting.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'jasper' comes from the Greek word 'iaspis', meaning 'spotted stone'. It was historically used for seals and amulets in ancient civilizations like the Egyptians and Minoans.

Field identification & locations

Identify in the field by its opacity (does not transmit light), smooth waxy feel when polished, and high hardness (will scratch glass). Common locations include India, Russia, Brazil, and the Southwestern United States.

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