Heulandite

heulandite_alpine_texas_mr_va2840_2391_2592hfc

This sample is from Alpine Texas and is shown at 3.3X and a FOV 7.14mm.

Heulandite was designated a series of minerals in 1997 by the International Mineralogical Association.  "Heulandite-Ca, the most common of these, is a(n) hydrous calcium and aluminium silicate, (Ca,Na)2-3Al3(Al,Si)2Si13O36·12H2O.", says Wikipedia.

Mindat comments that: There is some difficulty in distinguishing Heulandite from Clinoptilolite which we discussed recently.  I take that to mean that they are close in their properties.

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