sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Yellow to mustard brown; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (trigonal) microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Yellow to mustard brown
Luster: Vitreous to waxy

Identified June 2, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the infiltration of silica-rich fluids into volcanic ash or sedimentary deposits. The yellow color is primarily due to the presence of goethite or other iron hydroxide minerals. It typically dates from the Proterozoic to Recent periods depending on the specific deposit.

Uses & applications

Used extensively by lapidaries for cabochons, beads, and carvings. Historically used for making tools due to its hardness and sharp conchoidal fracture. It is also popular in metaphysical practices as a 'nurturing' stone.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'jasper' is derived from the Greek 'iaspis', meaning spotted stone. It has been used in jewelry for thousands of years, appearing in artifacts from Ancient Egypt and the Minoan civilization.

Field identification & locations

Identify by its opacity (even on thin edges), smooth waxy feel when polished, and lack of visible crystals. It is commonly found in riverbeds or as nodules in volcanic rocks. Significant deposits are found in India, Russia, Brazil, and the USA (California and Oregon).