sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite or Limonite inclusions
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
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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.
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