Gemstone profile and identification guide
Mutton Fat Jade
Mutton fat jade is a trade descriptor for high-quality creamy white jade material, commonly nephrite.
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Overview
Mutton fat jade is a trade descriptor for high-quality creamy white jade material, commonly nephrite.
Did you know? Historic East Asian jade valuation strongly emphasizes texture and translucency in white jade grades.
Use this profile as a collector reference and educational guide for quick on-page comparison, then validate with the interactive identification system.
Identification
Name: Mutton Fat Jade
Scientific classification: Jade Trade Descriptor (Usually Nephrite White Grade)
Hardness: 6.25 Mohs
Transparency: translucent
Lustre: greasy to waxy
Crystal system: Monoclinic aggregate context
Primary colour: Cream White
Secondary colour: Milky White
Colour family: Whites & Neutrals
Species testing is required because trade descriptor does not guarantee jadeite vs nephrite.
Verification Status
Status: verified-core-fields
Reference priority: GIA, Gem-A, Mindat, International Gem Society
Core identity, locality, and physical-property fields reviewed against standard gemological references.
Trade-name entries include conservative composition and treatment disclosures where needed.
Physical Properties
Hardness category: hard
Hardness value: 6.25 Mohs
Chemical composition: Commonly nephrite amphibole aggregate [Ca2(Mg,Fe)5Si8O22(OH)2]
Crystal system: Monoclinic aggregate context
Common locations: China (Xinjiang), Russia, Canada
Learn more: Gem-A gemstone education resources.
Colour Variations
Traditional trade term for creamy white jade, typically nephrite in many markets.
Optical effects: None specified in the current dataset.
Detailed Gemology
Mineral species: Typically nephrite (trade descriptor)
Mineral group: Jade aggregate materials
Chemical formula: Commonly nephrite amphibole aggregate [Ca2(Mg,Fe)5Si8O22(OH)2]
Mohs hardness: 6.25
Crystal system: Monoclinic aggregate context
Lustre: greasy to waxy
Transparency: translucent
Streak: White
Cleavage: Usually obscured by aggregate texture
Fracture: Splintery to uneven
Specific gravity: 2.90-3.10 (nephrite range)
Refractive index: Approximately 1.60-1.63 (spot values, nephrite context)
Optical phenomena: None typically diagnostic
Colour range: Creamy white to milky white
Common inclusions: Growth features, fractures, and matrix/inclusion structures as applicable
Geological environment: Species-dependent; see formation process
Principal mining regions: China (Xinjiang), Russia, Canada
Important commercial sources: Mutton fat jade is a trade quality descriptor and should be species-verified (typically nephrite)
Historical significance: Recognized in modern gem and mineral trade contexts.
Common treatments: Bleaching, dyeing, and impregnation may occur; disclose treatment status.
Synthetic or imitation forms: Imitations may exist depending on material category.
Common look-alikes: Species-dependent look-alikes in trade.
Jewellery uses: Used in carvings, bangles, pendants, and cultural art objects.
Care recommendations: Good toughness; avoid harsh chemicals and strong impacts on carvings.
Cross-check profile data with GIA Gem Encyclopedia and Mindat entry for Mutton Fat Jade.
Formation
Forms in metamorphic environments associated with serpentinized ultramafic systems.
Origin
Mutton fat jade is a trade quality descriptor and should be species-verified (typically nephrite)
Uses
Best for: Used in carvings, bangles, pendants, and cultural art objects.
Ideal uses: Fine carvings and culturally significant jade work.
Care
Good toughness; avoid harsh chemicals and strong impacts on carvings.
Need another candidate? Use advanced gemstone search or return to the identification guide.
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Mutton Fat Jade FAQ
How can I identify Mutton Fat Jade?
Compare hardness (6.25 Mohs), crystal system (Monoclinic aggregate context), colour profile, and lustre (greasy to waxy) with your sample. Then cross-check related gemstones listed above.
What colour range does Mutton Fat Jade appear in?
Traditional trade term for creamy white jade, typically nephrite in many markets.
Where is Mutton Fat Jade commonly used?
Fine carvings and culturally significant jade work.. For maintenance, follow the care guidance in this profile.
Scientific References
GIA: general gemstone identity (reviewed) - Batch 07 factual verification pass.
Gem-A: gemological terminology and testing references (reviewed) - Batch 07 factual verification pass.
Mindat: mineral species and principal localities (reviewed) - Batch 07 factual verification pass.
International Gem Society: gem trade context and treatment overview (reviewed) - Batch 07 factual verification pass.