xenomorphic
adj.
having an unusual shape, oddly shaped (Geology); anhedral, of or pertaining to a mineral grain that does not have its typical crystalline form but has a form stamped on it by grains that surround it
Xenomorph (geology)
A xenomorph (also: allotriomorph) is a
mineral that did not develop its otherwise typical external crystal form because of late crystallization between earlier formed crystals. Xenomorphs are typical of
matrix minerals in rapidly crystallizing
volcanic lavas and shallow
igneous intrusions. It is also typical of the interstitial or cementing minerals formed during the
diagenesis of
sedimentary rocks. The opposite is an idiomorph in which the external form is controlled only by the internal
crystal structure.
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xenomorphic
xenomorphic
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