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Identity HelpIs this harmotome or analcime?

3rd Mar 2012 13:40 UTCDavid Weiss

Acquired specimen recently. Dealer claims that it's from the Thura - Tunguska River Basin in Siberia Russia. I can't find any record of harmotome from that location, and the minerals habit reminds me of analcime. So two questions. Has harmotome been found in that location, and based on the picture, what species do you believe it to be? Thanks!

3rd Mar 2012 15:01 UTCRonald John Gyllenhammer Expert

> "...what species do you believe it to be?"


Hi David,


It looks like Analcime to me but you will be the best judge since you have it there. The locality is well known for great examples of Analcime. There are some differences between the two that can help you distinguish one from another. The characteristic shapes of both is a good place to start. Take a look at the crystal atlas rotating animation (especially #2) on the Analcime page here. http://www.mindat.org/min-210.html Does it have any evidence of good cleavage? Harmotome will often show a good cleavage, Analcime won't. Also Analcime is a bit harder. Good luck with it.


Ron

3rd Mar 2012 18:04 UTCJohan Kjellman Expert

I don't know how rare it is, but bear in mind that both harmotome and phillipsite can occur in complex twins with pseudocubic symmetry. I am NOT suggesting that it is the case here, just a possibility.


cheers

3rd Mar 2012 19:51 UTCFerdinando Giovine

I think this is a Analcime group specimen

4th Mar 2012 03:00 UTCPaul Brandes 🌟 Manager

Those look a lot like the analcimes one would find in the Keweenaw Peninsula of Michigan, another basalt deposit.

23rd Mar 2012 16:02 UTCEligiusz Szełęg Expert

Classic analcime sample from Tunguska River locality
 
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