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GERSDORFFITE CRYSTALS RARE Bou Azzer, MOROCCO




Item History & Price

Information:
Reference Number: Avaluer:4647340
Original Description:

GERSDORFFITE
* metallic-gray crystals of gersdorffite ** green crust of annabergite ** nice and very rare specimen from classic locality *

size: 35 X 33 X 17mm
weight: 34g
7A2
origin: Aït Ahmane, Bou Azzer District, Tazenakht, Ouarzazate Province, Drâa-Tafilalet Region, MoroccoGersdorffite is a nickel arsenic sulfide mineral with formula NiAsS. It crystallizes in the isometric system showing diploidal symmetry. It occurs as euhedral to massive opaque, meta...llic grey-black to silver white forms. Gersdorffite belongs to a solid solution series with cobaltite, CoAsS. Antimony freely substitutes also leading to ullmannite, NiSbS. It has a Mohs hardness of 5.5 and a specific gravity of 5.9 to 6.33.

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