Where is Nephrite Jade found?
Nephrite
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Open the appNephrite Jade occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Nephrite Jade
British Columbia, Canada
World's largest producer of nephrite, found in large alluvial boulders and in situ deposits within serpentinized ultramafic rocks in the Cassiar, Fraser River, and Lillooet areas.
Xinjiang, China (Kunlun Mountains)
Historically significant source, particularly for white (mutton fat) nephrite, found in alluvial deposits and in situ in metamorphic rocks.
Siberia, Russia (Lake Baikal region)
Known for high-quality green and black nephrite, occurring in serpentinite bodies.
New Zealand (South Island)
Known as 'Pounamu' by the Maori, found in river boulders and in situ in metamorphic rocks, particularly in the West Coast region.
Wyoming, USA
Historically a significant source of dark green to black nephrite, found in alluvial deposits and in situ in metamorphic terrains.
Taiwan
Produces a distinctive dark green to black nephrite, often with magnetite inclusions, associated with serpentinite.
Australia (South Australia)
Deposits of green nephrite found in metamorphic rocks.
Collecting tips
- Geological Context. Focus on areas with known serpentinized ultramafic rocks or contact metamorphic zones involving dolomitic limestones. Look for geological maps indicating these rock types.
- Alluvial Deposits. Many significant nephrite deposits are found as river-worn boulders in alluvial plains downstream from source rocks. Look in riverbeds, gravel bars, and ancient terraces.
- Hardness and Toughness. Nephrite is very tough. It will resist scratching by a steel knife (Mohs hardness 6-6.5). Its exceptional toughness means it's difficult to break, even with a hammer, often showing a splintery fracture rather than clean breaks.
- Density. Nephrite is relatively dense (specific gravity 2.9-3.03). A piece of nephrite will feel heavier than a similarly sized piece of quartz or common rock.
- Luster and Texture. Look for a greasy to waxy luster on broken or polished surfaces. The texture is typically smooth and dense, not granular.
- Color Variation. While green is common, be aware of other colors like white, cream, yellow, brown, grey, and black. Color can be uniform or mottled.
- Distinguishing from Look-alikes. Carry a small piece of known nephrite or jadeite for comparison. A scratch test against steel can help rule out softer look-alikes. A specific gravity test (even a rough one by hand) can help distinguish it from lighter materials. True jade (nephrite or jadeite) will not be easily scratched by a steel file.
Quick Check
- Color:
- Green, white, cream, yellow, brown, grey, black (often mottled)
- Luster:
- Greasy to vitreous, waxy
- Streak:
- White
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