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File:Corundum-t08-06a.jpg

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Description
English: Corundum
Locality: Passara Gem Mine, Badulla, Badulla District, Uva Province, Sri Lanka (Locality at mindat.org)
Size: thumbnail, 3.0 x 1.4 x 1.2 cm
Sapphire (twinned)
This exceptionally sharp sapphire crystal shows flanges to the sides that reflect a rare, well-formed twinning habit. Seldom do you see such a twin in the species, and usually it is present in rather clunky crystals. Specimens this sharp are hard to get because they mostly come from the gem gravels where they have been rolled and damaged in the past. This piece, however, comes from an excavation nearby and the crystal is nearly pristine. In person, it is extremely lustrous and bright! The bottom termination extends backwards in depth, showing a SECOND twinning plane in that the bottom section is rotated 90 degrees to the main body. If you hold this in your hands, in other words, it looks in person like an airplane, with the wings (upper twin flanges) in one plane and the bottom twin (rudder analogue) rotated into another plane around the core axis. Weight is approximately 25 carats. This crystal was sold as gem rough, by weight, at one of the gem shows. The price of $100 per carat is frankly not much of a markup since I had to buy it based on its weight as gem rough that could be treated and cobbed!
Deutsch: Korund
Fundort: Passara Gem Mine, Badulla, Badulla, Uva , Sri Lanka (Fundort bei mindat.org)
Größe: 3.0 x 1.4 x 1.2 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/t08-06a.jpg, Description: http://www.irocks.com/render.html?species=Corundum&page=14
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
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
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
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current22:04, 27 May 2010Thumbnail for version as of 22:04, 27 May 2010458 × 800 (99 KB)RKBot (talk | contribs)== {{int:filedesc}} == {{Information |Description= {{en|1=Corundum :: Locality: Passara Gem Mine, Badulla, Badulla District, Uva Province, Sri Lanka ([http://www.mindat

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