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Identity HelpBlack unknown with murdochite from Ojuela mine.
27th Feb 2012 23:53 UTCBrent Thorne Expert
Brent
28th Feb 2012 01:44 UTCRonald John Gyllenhammer Expert
I dont think this is Murdochite. These "black prismatic crystals" appear brassy in the image, an effect of the lighting I suppose or perhaps a minor coating of iridescent limonite? At any event, they remind me of Plattnerite. One visable termination looks tapered as with Plattnerite. Also it sort of looks like there's a penetration twin there, much like Plattnerite often shows. Good luck with it Brent.
Ron
28th Feb 2012 15:05 UTCUwe Kolitsch Manager
28th Feb 2012 15:57 UTCBrent Thorne Expert
A couple of other observations. Part of the matrix is tenorite and cuprite. Also, many of the crystals have penetration twinning at 90 degrees to each other.
Brent
28th Feb 2012 22:01 UTCLefteris Rantos Expert
I don't know about the orthorhombic dimorph of Plattnerite, Scrutinyite. Does anybody know if it could form twins at 90 degrees?
Lefteris.
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