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Identity HelpNeed locality - fan-shaped microcline crystal aggregate
19th Sep 2016 23:12 UTCHarold Moritz 🌟 Expert
A very cool fan-shaped aggregate of sub-parallel microcline (or perhaps orthoclase) with some quartz cling-ons. The terms of some of the microclines are hoppered. Measures 9x7x2.5 cm. From an old collection, no data, but supposedly he collected in New York State and never bought anything. Though some pieces are from Conn. and others must have been bought. I think this may be from New Hampshire. Anyway, thoughts appreciated.
20th Sep 2016 11:27 UTCErik Vercammen Expert
20th Sep 2016 14:44 UTCHarold Moritz 🌟 Expert
http://www.mindat.org/gallery.php?loc=3970&min=96
The dark matter is micaceous clove brown and a little waxy, looks like vermiculite, or fine-grained phlogopite.
Thanks Erik, it could be from NM. The original owner did make a fossil collecting trip to west-central Texas, so it could very well be from nearby Dona Anna Co.
20th Sep 2016 19:18 UTCMichael C. Michayluk
That's not to say it couldn't be from there... hopefully one of the more experienced New Mexico collectors comments
20th Sep 2016 19:54 UTCAlfredo Petrov Manager
20th Sep 2016 20:13 UTCHarold Moritz 🌟 Expert
Michael, thanks, that specimen is in the gallery I linked to earlier, I can see where there might be others that fully cover the K-spar, leaving a hole at the top where they pass over the K-spar termination. The elongated K-spar is unusual.
Alfredo, true, but the original owner had mostly fairly common things from a limited number of places, all USA, so I suspect it should be from someplace well known, but from decades ago.
20th Sep 2016 20:49 UTCPeter Slootweg 🌟
20th Sep 2016 21:00 UTCHarold Moritz 🌟 Expert
http://www.mindat.org/gallery.php?loc=3970&min=3026
It does look promising, though yeah probably will never know for sure, but the piece was too nice to not try.
I think we can ask the original owner if that place sounds familiar or more about its potential origin.
20th Sep 2016 21:53 UTCMichael C. Michayluk
20th Sep 2016 22:11 UTCDon Saathoff Expert
SO, with all this said, I doubt Rock Springs Canyon but who can know?
BTW, twinning tends to indicate orthoclase as opposed to microcline according to Dunham, 1934.
Don S.
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