Metamorphic Rock / Mineral

Jade (Nephrite or Jadeite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale (for both nephrite and jadeite)
Luster: Vitreous to greasy

Identified November 3, 2025More metamorphic rock / mineral →

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Physical properties

Hardness: 6-7 on Mohs scale (for both nephrite and jadeite). Color: Varies widely from white, cream, and pale green to dark green, black, lavender, and reddish-brown. The specimen appears to be a pale green or yellowish-green variety. Luster: Vitreous to greasy. Crystal Structure: Nephrite is an aggregate of fibrous microcrystals (actinolitic amphibole), making it very tough. Jadeite is made of granular microcrystals (pyroxene). The carving suggests the toughness characteristic of jade. Cleavage: Poor in nephrite, good in jadeite but rarely seen due to its aggregate nature. Specific Gravity: 2.9-3.38 (dependent on type).

Formation & geological history

Jade is formed under metamorphic conditions. Nephrite typically forms in serpentinized ultramafic rocks or in calcium-rich metamorphic rocks, often in subduction zones. Jadeite forms under high-pressure, low-temperature metamorphic conditions, also commonly associated with subduction zones. Both types are often found in areas of tectonic activity. The geological age varies depending on the specific deposit, but it is often associated with ancient mountain-building events.

Uses & applications

Historically and currently revered for carving, especially in Asian cultures, where it symbolizes purity, longevity, royalty, and good fortune. Used extensively for ornamental objects, jewelry (pendants like the one pictured, bracelets, beads), sculptures, and even tools in ancient times due to its exceptional toughness.

Geological facts

Jade is actually two different mineral species: Nephrite and Jadeite. While they look similar and are both called 'jade,' they have different chemical compositions and crystal structures. Jadeite is generally rarer, harder, and often found in more vivid colors than nephrite, making it typically more valuable. The term 'Imperial Jade' refers to a translucent, emerald-green variety of jadeite. The specimen in the image, with its intricate carving and translucent appearance, is characteristic of jade being used for decorative purposes.

Field identification & locations

In the field, raw jade can be identified by its distinctive tough, interlocking crystalline structure (difficult to break), its often waxy or greasy luster, and its characteristic range of colors. It's often found in alluvial deposits or as veins within metamorphic rocks. For collectors, distinguishing between nephrite and jadeite often requires gemological testing (e.g., specific gravity, refractive index), though general appearance can give clues. The specimen shows a finely carved piece, indicating it has already been processed for jewelry or ornamental use. Key identification features for carved jade include its cool, smooth feel, often slightly greasy luster, and the characteristic pale to vibrant green coloration that is common for the stone.

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Jade (Nephrite or Jadeite)

Nephrite: Ca2(Mg,Fe)5Si8O22(OH)2 (amphibole mineral); Jadeite: NaAlSi2O6 (pyroxene mineral)

Metamorphic Rock / Mineral

Jade (Nephrite or Jadeite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)

Metamorphic Rock / Mineral