metamorphic
Yellow Jade (Nephrite)
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
Hardness: 6-6.5 on Mohs scale; Color: Pale yellow to golden honey; Luster: Greasy to vitreous; Crystal Structure: Monoclinic (interlocking fibers); Cleavage: Indistinct; Specific Gravity: 2.90–3.03
- Hardness
- 6-6
- Color
- Pale yellow to golden honey
- Luster
- Greasy to vitreous
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Physical properties
Hardness: 6-6.5 on Mohs scale; Color: Pale yellow to golden honey; Luster: Greasy to vitreous; Crystal Structure: Monoclinic (interlocking fibers); Cleavage: Indistinct; Specific Gravity: 2.90–3.03
Formation & geological history
Formed through the regional metamorphism of magnesium-rich limestones (dolomites) or ultrabasic rocks. It is most commonly found in Precambrian to Mesozoic metamorphic belts.
Uses & applications
Used primarily in jewelry (beads, pendants), ornamental carvings, luxury decorative objects, and as a component in traditional 'healing' stones in various cultures.
Geological facts
Yellow jade is highly prized in Chinese culture as it represents imperial power and longevity. It is technically a nephrite mineral, which is tougher and more break-resistant than steel due to its densely interwoven fibrous structure.
Field identification & locations
Identify by its 'soapy' or greasy feel and high toughness. In the field, look for water-worn river boulders with a soft, buffed surface. Common locations include China (Liao Ning Province), Russia, British Columbia, and New Zealand.
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