sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow to honey gold; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mustard yellow to honey gold
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow to honey gold; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from water solutions or volcanic ash, often in coastal or river environments where minerals like iron oxide produce the yellow hue. It can range from millions to hundreds of millions of years old.
Uses & applications
Commonly used for lapidary work, jewelry (cabochons and beads), decorative ornaments, and widely collected as a metaphysical healing stone.
Geological facts
Jasper is an opaque variety of chalcedony. Yellow Jasper specifically has been used since ancient times as a stone of protection and discernment, and it is sometimes called 'Yellow Chalcedony' when more translucent.
Field identification & locations
Identify in the field by its hardness (it will scratch glass), its opaque to semi-translucent appearance, and its distinctive waxy sheen when weathered or tumbled. Common in river beds and desert regions worldwide.
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