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LocalitiesN'Chwaning II Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa

20th Mar 2012 23:34 UTCMike Salotti

I have a Bultfonteinite and Poldervaartite specimen labeled from this mine. Does anyone know why Poldervaartite is no longer a recognized mineral at this site? Thanks.

20th Mar 2012 23:38 UTCMike Salotti

I noticed it is still valid at the N'Chwaning I Mine.

21st Mar 2012 00:47 UTCAlfredo Petrov Manager

I think after olmiite was described, they all turned out to be olmiites?

21st Mar 2012 06:19 UTCRolf Brandt

Alfredo is right, after they discovered that some poldervaartite was wrongly identified as such, it is thought that most poldervaartites are actually olmiites. Problably similar to the sturmanite/ettringite problem, you have to analyse them to know what is what. Rolf

21st Mar 2012 17:06 UTCRichard Gunter Expert

Regarding Sturmanite, are not the bypyramidal, transparent, deep yellow-orange crystals always Sturmanite? I have never seen them described as anything else.

21st Mar 2012 20:15 UTCRolf Brandt

Hi Richard. you only know if you analyse the crystal, you can't "see" it

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