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Identity HelpMimetite and ???

18th Feb 2020 05:41 GMTdaniel kink

what other mineral is that on the front? thanks for the help guys

18th Feb 2020 06:14 GMTKeith Compton Manager


In order for us to help, you should follow these simple rules (which are requested at the beginning of starting any ID request):

Provide a useful photograph.
Is your photo out of focus, too bright, too dark? It's not hard to take an acceptable photo these days with your phone camera, it doesn't need to be a masterpiece of photography, but we need to be able to identify features in your specimen. If the photo isn't acceptable, sorry - we can't help.

Tell us where it's from.
Did you find this somewhere? If so tell us where. If you bought it, tell us as much as you can about where you think it might be from. If you really have no idea where it's from please tell us so. We may still be able to help.

Any distinguishing features?
Describe anything you can that gives us more information than we can tell in the photograph. Does it seem heavier than normal (dense) or light? If you've done any other physical tests such as hardness or acid testing please let us know, but don't attempt these unless you know what you're doing.

Having said that
I guess its from somewhere like Ojuela Mine in Mexico.

The transparent xls may be calcite (probably) or dolomite? (maybe);
The brown matrix - limonite; and
Some squiggly detrital hairs - unknown source !! (Always clean specimens of dust and particles before taking photo !)

18th Feb 2020 06:20 GMTdaniel kink

okay are the brownish reddish crytals on the front still mimetite?

18th Feb 2020 07:30 GMTStan Perry


I agree with Keith's opinion on minerals and location.  If I had to guess what the crystals on the mimetite are I would say calcite.  If you wanted to break one off and put in vinegar you should see some bubbling if it is calcite. 

18th Feb 2020 07:38 GMTKeith Compton Manager

Those included transparent xls are the same - just included with "Fe".

18th Feb 2020 10:31 GMTDana Slaughter

I agree with mimetite with calcite though I suspect that it is more likely from the Potosi mine, Santa Eulalia district, Chihuahua than the Ojuela mine. Few of the Ojuela mimetites of this habit from my experience were associated with calcite.

18th Feb 2020 11:02 GMTKeith Compton Manager


You well may be right re locality too (I hadn't even though of that one) but then I am 13,000 km from there!

27th Feb 2020 04:36 GMTGabriel Plattes

I'd also guess at Ojuela; the pale violet purple crystals could be adamite. Potosi x, Santa Eulalia, also produced similar mimetite, but if that is adamite, then Potosi might be ruled out, as I've not come across similar adamite in the images of the database of Mindat for Potosi x.
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