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Ettringite - N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape, South Africa
(#:MINS8674)
Specimen with Ettringite crystals up to 1,0 cm tall on contrasting matrix. They are a translucent bright lemon yellow colour. A nice specimen from the famous South African locality.
Formula :
Ca
6
Al
2
[(OH)
1
/(SO
4
)
3
] * 26 H
2
O
System:
hexagonal
Hardness:
2-2½
Rarity:
not common
Strunz id:VI/D.13-10 - SULFATES, CHROMATES, MOLYBDATES and TUNGSTATES
Name origin:
After the type locality at Ettringen, Rhineland-Palatinate, Germany.
Specimen weight:74 gr.
Crystal size:Up to 1,0 cm tall
Overall size: 52mm x 38 mm x 30 mm
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