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PhotosHematite - N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape Province, South Africa

11th Jul 2016 07:42 UTCHerwig Pelckmans

08740410016054488118627.jpg
Hematite
N'Chwaning II Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa
Copyright © Ru Smith
Very nice and extremely interesting specimen, Ru! Congrats!


Too bad there aren't any child photos, to get a better idea of how it looks in 3D ...

Could you please add a few?

Or eventually a crystal drawing ...


Cheers, Herwig

11th Jul 2016 12:47 UTCJohan Kjellman Expert

Herwig,

I think it's a pure side-view of a twin (c-axis horixontal). compare 282 and 326 of eisenglanz in goldschmidts atlas:

https://archive.org/stream/atlasderkrystalltaf03gold#page/98/mode/2up


cheers

12th Jul 2016 17:46 UTCHerwig Pelckmans

Dear Johan,


As usual, your posts are very educational and inspiring. So I got out the Goldschmidt Atlas and looked at the drawings you mentioned.

I can agree with your observations: we are looking at a side-view of the twin, but I do not think the drawings come close to this specimen.

Actually none of the drawings for hematite looked (very) similar ...


For me it looks like the angle between the major directions of the edges is just a little less than 90 degrees ... but then again I am only looking at the photo, not the real specimen.


I still hope Ru will provide us with more details ...


Cheers, Herwig
 
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