sedimentary

Yellow Jasper

Chalcedony (Silicon Dioxide with Iron inclusions), SiO2

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs; Color: Mustard to golden yellow; Luster: Vitreous to waxy; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91

Hardness: 6
Color: Mustard to golden yellow
Luster: Vitreous to waxy

Identified March 26, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Mustard to golden yellow; Luster: Vitreous to waxy; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91

Formation & geological history

Formed through the deposition of silica from mineral-rich waters or hydrothermal fluids into cracks or cavities. Its yellow hue is derived from high iron (Goethite) content. It can be found in sedimentary deposits or as a secondary mineral in volcanic rocks.

Uses & applications

Primarily used for lapidary work, jewelry (cabs and beads), decorative ornaments, and widely collected as a metaphysical or healing stone.

Geological facts

Jasper is a variety of chalcedony that is inherently opaque due to its high mineral impurity content. Yellow Jasper has been used since antiquity in amulets and has cultural significance in ancient Egyptian and Native American traditions.

Field identification & locations

Identify in the field by its opacity (unlike citrine which is translucent), its smooth 'waxy' texture when tumbled, and its ability to scratch glass. Commonly found in South Africa, USA, and Madagascar.