File:Ettringite-Kalahari-Namibia-205mm 0591.jpg

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search
Original file(1,800 × 1,433 pixels, file size: 1.14 MB, MIME type: image/jpeg)

Summary[edit]

Description
English: Ettringite
Locality: N'Chwaning I Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa (Locality at mindat.org)
Size: large cabinet, 19 x 13 x 11 cm
Ettringite
This is a huge specimen, with more ettringite in one place than I have ever seen. It is really subtle in its beauty, with oyelite between the cracks in the crystals, providing a white webwork background on which the powder-lemon-yellow crystals stand out all the more dramatically. There is some damage to the edges of the large crystal cluster, where peripheral-facing tips are missing or there is a contact point. But the core clustre is very 3-dimensional, gemmy, and capped by the best terminated crystal: The large crystal in the middle is 10 cm tall, and has a freestanding termination. Charlesite is a close relative of sturmanite and ettringite, and my understanding is that most crystals of either of the two yellow and more common species are actually zoned, and are thus partial charlesite. However, this crystal seems to have a pure, clear core which i suspect is charlesite, perhaps pure. (not analysed). Unusual, in any case! Even more than on other specimens in this lot, many crystals here appear to consist of a white charlesite crystal with an outer layer of powdery-lemon-yellow ettringite atop, from what i am given to understand about how these species form in a related series. The outer layer of colored ettringite is very thin, under 1 mm, and most of this crystal is therefore clear and colorless. These larger crystals (but not the smaller ones) are slightly etched and matte compared to other crystals in this pocket, perhaps part of the phenomena revealing the clear cores. I am sure all in this pocket are zoned in some degree to charlesite and/or sturmanite; but this one is distinctly different, with the totally clear core showing so nicely. A MUSEUM PIECE, in both size and visual impact, even for the public who will not care about the fascinating chemistry revealed here in a gigantic specimen of a very rare species. The backside of the specimen has hausmannite, hematite, and oyelite. 1.3 kilos.
Deutsch: Ettringit
Fundort: N'Chwaning I Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Nordkap , Südafrika (Fundort bei mindat.org)
Größe: 19 x 13 x 11 cm
Date before March 2010
Source Image: http://www.irocks.com/db_pics/new2010/Ettringite-Kalahari-Namibia-205mm_0591.jpg, Description: http://www.irocks.com/render.html?species=Ettringite&page=4
Author
Other versions

Licensing[edit]

Rob Lavinsky, the copyright holder of this work, hereby publishes it under the following license:
w:en:Creative Commons
attribution share alike
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
Attribution: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).
  • share alike – If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one.

OTRS Wikimedia

This work is free and may be used by anyone for any purpose. If you wish to use this content, you do not need to request permission as long as you follow any licensing requirements mentioned on this page.

Wikimedia has received an e-mail confirming that the copyright holder has approved publication under the terms mentioned on this page. This correspondence has been reviewed by an OTRS member and stored in our permission archive. The correspondence is available to trusted volunteers as ticket #2010022810018255.

If you have questions about the archived correspondence, please use the OTRS noticeboard.


Ticket link: https://ticket.wikimedia.org/otrs/index.pl?Action=AgentTicketZoom&TicketNumber=2010022810018255

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current04:00, 27 May 2010Thumbnail for version as of 04:00, 27 May 20101,800 × 1,433 (1.14 MB)RKBot (talk | contribs)== {{int:filedesc}} == {{Information |Description= {{en|1=Ettringite :: Locality: N'Chwaning I Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, [[:en:Northern Cape|Northern Cape Province
  • You cannot overwrite this file.

The following page links to this file:

File usage on other wikis

The following other wikis use this file:

Metadata