sedimentary
Yellow Jasper
Chalcedony (Silicon Dioxide with Iron inclusions), SiO2
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
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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.
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