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Hi,
Judging by the jpegs and the copper association your mystery mineral
looks exceedingly like a copper sulphate. Natural copper sulphates
can occur as brochantite (Cu4SO4{OH}6) or antlerite Cu3SO4{OH}4 or
chalcanthite (CuSO4.5H2O). All are soluble in water; all are found
in the oxidized portion of copper deposits especially in desert
regions. It's likely not antlerite because that is green.
Unless you can get a provenance it has little value as a specimen;
and so you might try scraping a bit of the material from an
inconspicuous corner, dissolving it in water, and then putting a few
drops of the solution on a steel knife blade. It should copper-plate
the steel.
Cheers,
Hans Durstling
Moncton, Canada
www.virtualfundy.com
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