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Assistance in getting locality info for this Mexican? orthoclase & amphibole specimen
  
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waltlombardo




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PostPosted: Nov 17, 2017 13:33    Post subject: Assistance in getting locality info for this Mexican? orthoclase & amphibole specimen  

I acquired this mineral specimen from a university. It was part of a collection donated by Sy Sussman in the late 1970's. The specimen locality was given as Mexico. Any suggestions as to where, or if it even is a Mexican specimen?


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Tobi




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PostPosted: Nov 18, 2017 01:21    Post subject: Re: Assistance in getting locality info for this Mexican? orthoclase & amphibole speci  

waltlombardo wrote:
I acquired this mineral specimen from a university. It was part of a collection donated by Sy Sussman in the late 1970's. The specimen locality was given as Mexico. Any suggestions as to where, or if it even is a Mexican specimen?
To be honest, I've never seen something like that from Mexico. It rather looks like a typical specimen of arfvedsonite (which IS an amphibole group mineral) on orthoclase from Mount Malosa in Malawi ...
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Peter Lemkin




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PostPosted: Nov 18, 2017 01:58    Post subject: Re: Assistance in getting locality info for this Mexican? orthoclase & amphibole speci  

It looks a little like the orthoclase/tourmaline I used to collect in San Diego Co. CA, just a few miles from the Mexico border. However, from the photo I can't tell if that is tourmaline or not. In that locality, the tourmaline came in both the classic form and something that looked like that....just a possibility. Test a piece of the black for s.g. and hardness. The pegmatites continue far into Baja CA, Mexico from where I was collecting - and it could be from other pegmatites in Mexico, as well.
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John S. White
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PostPosted: Nov 18, 2017 05:25    Post subject: Re: Assistance in getting locality info for this Mexican? orthoclase & amphibole speci  

Where is Peter Megaw when you need him? If it is Mexican he will be familiar with it for sure. Peter is probably travelling or he would have posted a comment by now.
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marco campos-venuti




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PostPosted: Nov 18, 2017 06:31    Post subject: Re: Assistance in getting locality info for this Mexican? orthoclase & amphibole speci  

I found a specimen in mindat from Durango with very similar appearance, labeled orthoclase with horneblende. Photo is by Rock Currier and specimen is from the collection of Miguel Romero.
mindat.org/photo-278555.html
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