microclase

microclase Min.

(ˈmaɪkrəʊkleɪs)

[ad. G. mikroklas, f. Gr. µῑκρό-ς small + κλάσις cleavage.]

A potash-soda felspar occurring intercrystallized with orthoclase, from the St. Gotthard, Switzerland (Cassell's Encycl. Dict. 1885).