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GeneralColemanite and others

26th Oct 2014 00:45 UTCDan Costian

Here is a specimen labeled colemanite from Inyo County, CA. Probably from Sigma Mine, Ryan, Furnace Creek District, Death Valley.

I wonder what could be other minerals associated to it? Some pseudo, too?

Thanks for your help.

Dan

26th Oct 2014 07:27 UTCRock Currier Expert

I would check it with a drop of acid to make sure it is not calcite, though it probably is not. the small drusy crystals may just be small colemanites if the big ones are too.

26th Oct 2014 13:16 UTCDan Costian

Thank you Rock. You are #1 expert in colemanite. It does not fizz.

I was hoping you'll see some meyerhofferite and black dots of todorokite :-)

Cheers,

Dan

27th Oct 2014 00:01 UTCRock Currier Expert

It doesn't look like any meyerhofferite I have ever seen either primary or secondary. You could flake off a few micro crystals and have them x-rayed to know for sure what they are. Or you might even have fun by running the old prospector test by grinding a few of them up to a powder between two spoons, dissolving the powder in a few drops of acid, adding ethanol and lighting it on fire to see if you can get a green flame. That would be indicative of it being a borate but probably not proof positive.

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