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GeneralIncorrect type-locality for nimite

25th Jan 2017 09:20 GMTBruce Cairncross Expert

On the nimite page https://www.mindat.org/min-2905.html the type locality description: Type Locality: Scotia Talc mine, Bon Accord, Barberton, Ehlanzeni District, Mpumalanga Province, South Africa is incorrect. De Waal (1970) states: A nickel-rich chlorite, nimite, comes from a small tabular body of nickeliferous rock about two miles west of the Scotia Talc Mine, in the Barberton Mountain Land. The type-locality should therefore be Bon Accord nickel deposit.

25th Jan 2017 11:55 GMTBruce Cairncross Expert

There are some edits needed for the Scotia talc mine and Bon Accord nickel deposit in South Africa. All five type-locality species listed for Scotia Talc mine - bonnacordite, nimite, willemseite, trevorite and liebenbergite - should be moved across to Bon Accord, the type-locality.


See: De Waal, S.A., (1978). The nickel deposit at Bon Accord, Barberton, South Africa a proposed paleometeorite. Special Publication Geological Society of South Africa, 4, 87-98.

25th Jan 2017 13:15 GMTBruce Cairncross Expert

Third time lucky .... Bon Accord Nickel mine and Bon Accord are one and the same and need to be merged into one Bon Accord locality. The nickel deposit was named after the farm Bon Accord. So this https://www.mindat.org/loc-15029.html and this https://www.mindat.org/loc-21931.html are in fact the same. My comment above about moving the type-species from the Scotia talc mine to Bon Accord still stands.

25th Jan 2017 13:59 GMTHarold Moritz Expert

I think IMA designates the type localities and so mindat can only reflect what they say, even if wrong. Finding out how IMA made that determination or how to change it may be difficult. But I suppose one could check their web site or contact them. I know of two minerals that should have their type locality changed (chrysoberyl and tungstite) but have not had the time to pursue it.

25th Jan 2017 14:03 GMTDavid Von Bargen Manager

Are all the minerals on the Scotia talc mine actually from the Bon Accord mine?

Is there a Scotia talc mine?

25th Jan 2017 14:42 GMTBruce Cairncross Expert

Yes there is a Scotia talc mine and there is no reference article to this specific mine, to my knowledge, at any rate. I've just checked the Scotia talc mine https://www.mindat.org/loc-4378.html which lists:


Bonaccordite (TL)

ⓘBunsenite

ⓘGaspéite

ⓘGoethite

ⓘLiebenbergite (TL)

ⓘMillerite

ⓘNépouite

Nimite (TL)

ⓘOpal

ⓘReevesite

ⓘTrevorite (TL)

ⓘViolarite

ⓘWillemseite (TL)


None of these other than perhaps goethite and common opal should be listed. The mine exploited talc from a highly altered serpentinite, its a solid mass of talc, so I don't see any of these other minerals occurring there. Strangely enough, talc isn't listed! The single reference listed for the Scotia talc mine, Villanova et al (2014) says this locality is located near Bon Accord and that's all it says about Scotia so it should be removed - see attached PDF of this abstract.


I also just checked the IMA November 2016 list of minerals and this is the entry for nimite:


Nimite (Ni,Mg,Al)6(Si,Al)4O10(OH)8 A 1971 s.p. South Africa American Mineralogist 55 (1970), 18.


So I cross-checked the 1970 American Mineralogist reference listed above by the IMA and it is the article by de Waal (which I have, see attached PDF) and he clearly states in the first line of the abstract: A nickel-rich chlorite, nimite, comes from a small tabular body of nickeliferous rock about two miles west of the Scotia Talc Mine, in the Barberton Mountain Land.


So should try and fix these two localities.



 
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