File:Achtaragdite-433778.jpg

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Achtaragdite-433778.jpg ‎(465 × 417 pixels, file size: 132 KB, MIME type: image/jpeg)

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Description
English: Grossular-Hibschite Series (Variety Achtaragdite)
Locality: Akhtaragda River mouth (Achtaragda River mouth), Vilyui River Basin (Vilui River Basin; Wilui River Basin), Saha Republic (Sakha Republic; Yakutia), Eastern-Siberian Region, Russia
Size: 2.5 x 2.4 x 1.5 cm
Achtaragdite is a unique, rare and poorly understood pseudomorph from this remote Siberian locality that is the Type Locality for grossular garnet. It is a variety of the grossular-hibschite garnet series and is (technically, according to Internet research) a hydrogrossular-chlorite-carbonate pseudomorph after what was formerly considered to be wadalite or some other rare hydrogarnet. The real precursor mineral for these pseudomorphs is now considered to be helvite. The very lightweight floater crystal (a combination of grossular and intergrown kaolinite) has the very sculptural textbook form of isometric helvite crystals. This unusual and rare pseudomorh is an old-time piece, as it comes with a faded Lazard Cahn label dating from 1927-1940. Cahn studied in Germany prior to World War I under Victor Goldschmidt. This amazing pseudo undoubtedly dates to the Imperial Russia era.
Deutsch: Grossular-Hibschit-Reihe (Varietät Achtaragdit, auch Achtarandit)
Fundort: Akhtaragda River mouth (Achtaragda River mouth), Wiljui Fluss Becken, Republik Sacha (Jakutien), Ostsibirien, Russland
Größe: 2,5 x 2,4 x 1,5 cm
Pseudomorphose von Grossular-Katoit-Mischkristallen nach Mayenit vom Wilui Fluss
Date before December 2011
date QS:P,+2011-12-00T00:00:00Z/7,P1326,+2011-12-00T00:00:00Z/10
Source http://www.mindat.org/photo-433778.html
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
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creator QS:P170,Q56247090
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Rob Lavinsky, the copyright holder of this work, hereby publishes it under the following license:
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Attribution: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
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current19:46, 27 November 2012Thumbnail for version as of 19:46, 27 November 2012465 × 417 (132 KB)Ra'ike (talk | contribs)== {{int:filedesc}} == {{Information |Description= {{en|1=Grossular-Hibschite Series (Variety ''Achtaragdite'') :: Locality: Akhtaragda River mouth (Achtaragda River mouth), Vilyui River Basin (Vilui River Basin; Wilui River Basin...

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