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Duftite on Calcite - Tsumeb Mine, Otjikoto Region, Namibia
(#:MINS7841)
Rhombic calcite crystals to 1,0 cm with bright-green crystals of Duftite coating on the surface.Showy.
Formula :
PbCu
^
2+[OH/AsO
4
]
System:
orthorhombic
Hardness:
3
Rarity:
not common
Strunz id:VII/B.26-80 - PHOSPHATES, ARSENATES and VANADATES
Name origin:
Named by Otto Pufahl in 1920 for Gustav Bernhard Duft [b. 1859 Clausthal, Germany - 1924?], second General Manager of the Tsumcor Mine (Tsumeb Mine), Namibia (~1906), but Duft was active in Namibia as early as 1892. Guillemin (1956) distinguished two kinds of duftite: "duftite-α" = duftite (space group Pnam) and (Ca-bearing) "duftite-β" = duftite (space group P212121).
Specimen weight:35 gr.
Crystal size:Sub-mm
Overall size: 60mm x 40 mm x 15 mm
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