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Identity HelpBrochantite???

19th Nov 2016 16:38 UTCDonn Cuson

02049130016059626153395.jpg
I believe this is Brochantite which I collected yesterday down near Duquesne, Arizona. Need some confirmation, what do you think? Quick photo so not real great. About 2mm crystals.


19th Nov 2016 18:31 UTCReiner Mielke Expert

Could be malachite, test with acid, brochantite does not fizz in acid.

20th Nov 2016 02:17 UTCPaul Brandes 🌟 Manager

Brochantite and Malachite can be very difficult to distinguish when they are this small, but I would lean more towards Malachite since Brochantite isn't listed as a mineral species from that area. Doesn't mean it couldn't be there, but have to go with what data is available.

10th Dec 2016 17:48 UTCUwe Kolitsch Manager

Another vote for malachite being more probable.

A simple test with dilute acid will certainly help.

10th Dec 2016 19:00 UTCDonn Cuson

I had several of the micromount guys at the club (Tucson Gem & Mineral) take a look and they identified it as Malachite, so I am going with Malachite. Its pretty small to remove anything to test it with acid. Thanks for the help

10th Dec 2016 19:28 UTCUwe Kolitsch Manager

"Its pretty small to remove anything to test it with acid."


A tiny fragment can be removed with a sharpened thin needle (or acupuncture needle) and pushed into in a drop of dilute acid on a glass slide (under a microscope).

11th Dec 2016 04:02 UTCD. Peck

I agree with Uwe. It only takes a tiny fragment . . . and you may be able to get it from another location on your specimen.
 
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