metamorphic
Yellow Jade
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
Hardness: 6-6.5 (Mohs scale); Color: Pale yellow to golden yellow; Luster: Vitreous to greasy; Crystal structure: Monoclinic; Cleavage: Good, but often obscured by fibrous habit; Specific gravity: 2.9-3.4
- Hardness
- 6-6
- Color
- Pale yellow to golden yellow
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 6-6.5 (Mohs scale); Color: Pale yellow to golden yellow; Luster: Vitreous to greasy; Crystal structure: Monoclinic; Cleavage: Good, but often obscured by fibrous habit; Specific gravity: 2.9-3.4
Formation & geological history
Formed through the metamorphism of magnesium-rich limestones (dolomites) or through the hydrothermal alteration of ultramafic rocks. It is found in mountain-building zones where high pressure and low heat occurred.
Uses & applications
Primarily used in jewelry (beads, pendants), ornamental carvings, and 'healing' stones. In some cultures, it represents wealth and good fortune.
Geological facts
Yellow jade is specifically valued for its sunny hue, which is often caused by inclusions of iron or tantalum within the nephrite structure. It has been a symbol of the Chinese Emperor and associated with the solar plexus chakra in modern spirituality.
Field identification & locations
Identify by its waxy/greasy luster and relative toughness. It cannot be scratched by a copper penny but can be scratched by quartz. Look for its characteristic 'mutton fat' texture in high-quality specimens. Found commonly in China, Myanmar, Russia, and Canada.
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