n.1.(Min.) A variety of native Epsom salt occurring in silky fibers.
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Melanterite and epsomite were easily identified (especially after some exquisite microcrystals disintegrated to an opaque white powder), and the hair-salt series of minerals (pickeringite/apjohnite/halotrichite) was not difficult to recognize, but the identity of a tiny greenish smear on one sample was not at all obvious.
Epsomite and melanterite and their dehydration products are fairly easily found, and the hair-salt series is very common.
Apjohnite occurs commonly as clear needles and silky masses of typical hair-salt appearance; most specimens of hair salt were identified as magnesian apjohnite by semiquantitative analysis with SEM/XRF (most analyses higher in Mn than Mg, with little or no Fe).