Fahlunite

Fahlunite

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4.1" Steel Blue FAHLUNITE Crystal Pseudomorph after Iolite Connecticut for sale

4.1" Steel Blue FAHLUNITE Crystal Pseudomorph after Iolite Connecticut for sale

Here is a good example of the rare mineral fahlunite: (Mg,Fe)Al2Si3O10 · 2H2O.  The fahlunite i.....
$65.00