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LocalitiesLordsburg Mining District, Pyramid Mountains, Hidalgo County, New Mexico, USA

30th Nov 2014 21:46 UTCReiner Mielke Expert

I recently acquired a specimen labelled as coming from this area. It consists of bornite with magnetite and minor mica. The really unusual thing about it is the magnetite. It is coarse gained ( 1cm) and every grain has a very strong parting to the extent that it is laminated. The laminations in each grain are a different orientation so it can not be due to shearing. Between the lamellae is what appears to be pyrrhotite ( giving it a golden color) and in some grains white talc. I will post a photo eventually but it will be difficult to get a good one as the structure can best be seen by slowly rotation the sample and observing the reflections off the lamellae. Anyone ever heard of such a thing? Any ideas which mine it is from?
 
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