Home Page	Log In	Messageboard	The Mindat Directory
Register	Search Pages	Mineral Chatroom	The Mindat Store

Welcome!

N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa

Posted by Mike Salotti

Forum List Message List

Mike Salotti

N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
March 20, 2012 11:34PM

Registered: 5 years ago
Posts: 131

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.

Reply Quote

Mike Salotti

Re: N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
March 20, 2012 11:38PM

Registered: 5 years ago
Posts: 131

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

Reply Quote

Alfredo Petrov

Re: N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
March 21, 2012 12:47AM

Registered: 7 years ago
Posts: 5,814

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

Reply Quote

Rolf Brandt

Re: N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
March 21, 2012 06:19AM

Registered: 4 years ago
Posts: 74

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

Reply Quote

Richard Gunter

Re: N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
March 21, 2012 05:06PM

Registered: 1 year ago
Posts: 119

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

Reply Quote

Rolf Brandt

Re: N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa
March 21, 2012 08:15PM

Registered: 4 years ago
Posts: 74

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

Reply Quote

Forum List Message List Newer Topic Older Topic

Print View RSS

Author:

Subject:

Attachments:

Attach a file (photo)

Valid attachments: jpg, gif, png, pdf
No file can be larger than 1000 KB
3 more file(s) can be attached to this message

Help information

Spam prevention:

Please, enter the code that you see below in the input field. This is for blocking bots that try to post this form automatically. If the code is hard to read, then just try to guess it right. If you enter the wrong code, a new image is created and you get another chance to enter it right.

Enter code:

Message:

Mineral	and/or Locality
Search Google

Copyright © Jolyon Ralph and Ida Chau 1993-2013. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
Current server date and time: 22nd May 2013 00:52:05