sedimentary

Yellow Jasper

Silicon Dioxide (SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Yellow to mustard-brown; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal) microcrystalline silica; Cleavage: None; Specific gravity: 2.58–2.91.

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

Identified March 5, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Yellow to mustard-brown; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal) microcrystalline silica; Cleavage: None; Specific gravity: 2.58–2.91.

Formation & geological history

Formed through the infiltration of silica in sedimentary environments or volcanic ash during the process of hydrothermal activity or lithification. Its yellow color comes from iron impurities such as goethite.

Uses & applications

Commonly used in lapidary arts for cabochons, beads, and decorative carvings. It is also a popular collector's mineral and used in crystal therapy.

Geological facts

Jasper is an opaque variety of chalcedony. The word 'jasper' comes from the Greek word 'iaspis', meaning 'spotted stone'. In ancient times, it was believed to provide protection and mental clarity.

Field identification & locations

Identify in the field by its opacity (unlike translucent agate), waxy feel when polished, and lack of visible crystals. It is found globally, with major deposits in India, Russia, Brazil, and the USA.