Iceland spar and Tunguska

[Ya Sam]

"The only deposits of optical calcite (Iceland spar) in Russia were found on 
the banks of the river Nijnaya Tunguska. From 1950 to 1990 the East-Siberian 
geological-prospecting expedition "Spar" (which is based in Tura) 
prospected, exploited and delivered the polarizable prisms to the consumers 
of the whole country. Nowadays the need in optical calcite has fallen down."

http://www.evenkya.ru/eng/?id=obsh&sid=admterdel&ssid=2

"The native evenks people call iceland spar (optical calcite) as ellun (the 
sky stone). The greatest in the world deposites of this valuable optical 
material are situated in Northern Siberia on Nizhnaya Tunguska 
(Sullen-River, by russian writer V.Shishkov) and it tributaries. Seldom why 
knows about these deposits, about their unique mineralogical associations, 
about the Nature of Evenkiya - the most seldom settle populated and hardly 
accesible region of the world. In the upper north tributary of Tunguska, 
Vivi, there is the monument marking the centere of Russia. Close to this 
place some people until now try to find the crater of Tunguska fireball. 
"...

"In the beginning of July the expedition plans to arrive to the capital of 
Evenkiya - Tura by airliner from Krasnojarsk. In Tura there is the biggest 
in the world museum of Iceland Spar, created by geological undertaking 
"Spat". ..

"Below the mouth of Nidym on both banks of Nizhnaya Tunguska on distance of 
70 km. there is the chain of the largest in the wold iceland spar deposits: 
Poledjicit, Gonchak, Krutoe, Babkino. Final point of expedition - the 
Degigli riever, where in 1981 the lagest analcite crystals were found. "

http://www.ccas.ru/galiulin/elleng.html

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