Allt a'Mhuillin, Loch Borrolan, Assynt, North West Highlands, Scotland

8.6 x 4.5 x 4.4 cm

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Ex. Carniege Museum, White Colleition, Ex. Cureton Minerals

Na₈(Al₆Si₆)O₂₄(SO₄)·2H₂O

Massive light blue Vishnevite in a Borolanite matrix. Borolanite is a name locally used (and named for the locale) for a variety of coarse grained nepheline syenite composed of alkali feldspar,Nepheline and/or its alteration products, Melanite and Biotite.

Condition: Good

Flaws: Essentially massive material.

This mineral is also found in the following galleries: Minerals From Europe | Tectosilicates | Rare Minerals | Minerals Priced Between 25 and 49 Dollars