File:Olmiite-olm-07d.jpg

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Olmiite-olm-07d.jpg (400 × 244 pixels, file size: 34 KB, MIME type: image/jpeg)

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Description
English: Olmiite
Locality: N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa (Locality at mindat.org)
Size: small cabinet, 8.3 x 4.7 x 3.3 cm
OLMIITE
A rather unusual specimen featuring, instead of a spherical aggregate of small crystals, rather large crystals arranged in a radial spray. In fact, we have here two crystal groups, one atop the other. This piece was unique in my lot of around 100 pieces, and I have still nto seen another quite like it. It has good color, but effectively no sparkle - it has a matte lustre to the surface. Still, it is dramatic, large, and i think significant for the species in the size and habit of these radially grown larger crystals (to 4 cm). The association seems to be pectolite, but I haven't had it tested to be sure. None of my other specimens have this matrix, leading me to suspect this unusual specimen was formed under threshold conditions at the edge of the main pocket, apart from the rest.
Deutsch: Olmiit
Fundort: N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Nordkap , Südafrika (Fundort bei mindat.org)
Größe: 8.3 x 4.7 x 3.3 cm
Date before March 2010
date QS:P,+2010-03-00T00:00:00Z/7,P1326,+2010-03-00T00:00:00Z/10
Source Image: http://www.irocks.com/db_pics/pics/olm-07d.jpg, Description: http://www.irocks.com/render.html?species=Olmiite&page=0
Author
Robert M. Lavinsky  (1972–)  wikidata:Q56247090
 
Alternative names
Robert Matthew Lavinsky; Lavinsky, Robert M.; Lavinsky R M
Description American mineral collector and mineral dealer
iRocks.com (Mineralogical Record)
Date of birth 13 December 1972 Edit this at Wikidata
Location of birth Columbus Edit this at Wikidata
Authority file
creator QS:P170,Q56247090
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Rob Lavinsky, the copyright holder of this work, hereby publishes it under the following license:
w:en:Creative Commons
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Attribution: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
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current11:34, 27 May 2010Thumbnail for version as of 11:34, 27 May 2010400 × 244 (34 KB)RKBot (talk | contribs)== {{int:filedesc}} == {{Information |Description= {{en|1=Olmiite :: Locality: N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, S

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