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Sprays of the rare inosilicate wollastonite (to about 4 mm) line a protected vug in typical volcanic matrix from Monte Somma. Wollastonite is actually a group of several polytypes crystallizing in both the triclinic and monoclinic systems. The wollastonite is undamaged. For more information on this interesting mineral, see the Mindat species page. From my personal collection. 8.2 x 4.8 x 3.8 cm.
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