a.1.Having a slender elongated form, like a lath; - said of the feldspar of certain igneous rocks, as diabase, as seen in microscopic sections.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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lath-shaped plagioclase crystals partially or completely included within pyroxene crystals), although the pyroxene has usually been altered to uralite.