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a. A microscopic crystal that polarizes light and has some determinable
optical properties. CF: crystallite;
crystalloid. Syn: microlith AGI
b. A pale-yellow, reddish, brown, or black isometric mineral of the
pyrochlore group: (Ca,Na)2 Ta2 O6 (O,OH,F). It is
isomorphous with pyrochlore, and it often contains small amounts of other
elements (including uranium and titanium). Microlite occurs in granitic
pegmatites and in pegmatites related to alkalic igneous rocks, and it
constitutes an ore of tantalum. Syn: djalmaite
Source:
Dictionary of Mining, Mineral, and Related Terms
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