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Identity HelpMalachite?

20th Nov 2019 00:02 UTCIan Carlson

01937200015742081351310.jpg
Hey all,

As always your help is appreciated. I found the following in a location that is heavily copper bearing east of Florence near the Phoenix, AZ area. I just want to confirm that the green is malachite before I would falsely advertise any jewelry I might make out of it. I'll add a second photo with a small piece I cut out.

20th Nov 2019 00:03 UTCIan Carlson

02076450015742081699017.jpg
Thanks again, y'all

20th Nov 2019 01:13 UTCThomas Lühr Expert

Hello Ian

Malachite will effervesce with a drop of muriatic acid. Similar pseudomalachite or brochantite will not.

Thomas

20th Nov 2019 01:33 UTCKevin Conroy Expert

It looks like chrysocolla to me.

20th Nov 2019 02:54 UTCKeith Compton Manager

I would have thought more likely to be Chrysocolla - particularly based on the polished piece

20th Nov 2019 15:29 UTCPaul Brandes Manager

Should be easy to distinguish between the two with a drop of muriatic acid....

20th Nov 2019 16:17 UTCIan Carlson

All,

I will try the drop of muriatic acid this evening. Is it my understanding that chrysocolla won't effervesce under the acid but malachite will?

Qith the information I've gotten thusfar, it's very likely to be chrysocolla. That's what the site I went to is known for, I just didn't realize it could be so close to green.

Thanks again!

20th Nov 2019 16:34 UTCThomas Lühr Expert

I will try the drop of muriatic acid this evening. Is it my understanding that chrysocolla won't effervesce under the acid but malachite will?
Yes, this is right. And a crumb of chrysocolla will not dissolve (almost) instantly as brochantite would do and, in contrast to pseudomalachite, it would leave a residue (of silica).
The color of chrysocolla is quite variable (even yellow!!!), but i would expect it also more bluish, which doesn't mean much, however.
 
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