Chinese
Name:黑色軟玉, 黑玉, 墨玉
English Name:Black Nephrite, Black Jade, Ink Jade, Black Nephrite Jade
Chemical Composition:Ca2(Mg,Fe)5(OH)2 basic calcium mag. iron silicate
Crystal System:Moloclinic (Polycrystalline)
Hardness:6.0 - 6.5
SG:2.90 - 3.03
RI:1.600 - 1.627 (Double refraction
-0.027)
Related Chakra:Root
Locality:Canada, Australia, USA
Colour:Black, Dark Greenish Black, Grey-black
Remarks:Nephrite jades of a black or nearly black colour, which is usually caused by microscopic inclusions of dark minerals, mainly graphite.
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