sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite or Limonite inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale. Color: Mustard yellow to brownish-yellow. Luster: Vitreous to waxy. Crystal structure: Hexagonal (trigonal) microcrystalline. Cleavage: None. Specific gravity: 2.6-2.9.

Hardness: 6
Color: Mustard yellow to brownish-yellow
Luster: Vitreous to waxy

Identified July 16, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 on Mohs scale. Color: Mustard yellow to brownish-yellow. Luster: Vitreous to waxy. Crystal structure: Hexagonal (trigonal) microcrystalline. Cleavage: None. Specific gravity: 2.6-2.9.

Formation & geological history

Formed primarily in sedimentary environments where hydrothermal fluids or groundwaters circulate through volcanic ash or sedimentary beds, depositing silica in voids. The yellow color is due to the presence of iron oxide minerals like goethite.

Uses & applications

Widely used for lapidary work including cabochons, beads, and decorative carvings. It is also a popular collector stone and used in metaphysical practices.

Geological facts

Jasper is an opaque variety of chalcedony. Historically, it was known as a 'rain bringer' in ancient civilizations. Yellow Jasper is specifically associated with the solar plexus chakra in certain traditions.

Field identification & locations

Identify in the field by its opacity (unlike translucent agate), conchoidal fracture, and smooth, waxy feel when water-worn. Common in river beds and coastal areas worldwide, particularly in India, Russia, and the USA.