![Nephrite Jade (Tremolite-actinolite series [Ca2(Mg,Fe)5Si8O22(OH)2]) — metamorphic](https://media.rock.id/nephrite-jade-36823928-8c29-44cd-a2b4-72f5c89dc706-compressed.jpg)
metamorphic
Nephrite Jade
Tremolite-actinolite series [Ca2(Mg,Fe)5Si8O22(OH)2]
Hardness: 6-6.5 Mohs; Color: Dark green, oily luster, extremely tough due to interlocking fibrous structure, opaque to translucent.
- Hardness
- 6-6
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Physical properties
Hardness: 6-6.5 Mohs; Color: Dark green, oily luster, extremely tough due to interlocking fibrous structure, opaque to translucent.
Formation & geological history
Formed by the metamorphism of magnesium-rich rocks (like serpentinite) or siliceous dolomitic limestones under high pressure and moderate temperatures.
Uses & applications
Widely used for ornamental carvings, jewelry, axe heads in prehistoric cultures, and as a durable decorative stone.
Geological facts
Nephrite is one of two minerals known as jade (the other being Jadeite). It is famous for its incredible toughness because of its felted, interweaving crystalline structure.
Field identification & locations
Often found in river beds or coastal areas as water-worn pebbles. Identified by its waxy/oily surface when wet and 'soapy' feel; it is too hard to be scratched by a steel nail.
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