Also allotriomorphic. Petrography. noting or pertaining to a mineral grain that does not have its characteristic crystalline form but has a form impressed on it by surrounding grains; anhedral.
in an unusual form; having a strange form.
Origin of xenomorphic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
(of a mineral constituent of an igneous rock) not having its characteristic crystal shape because of deforming pressure from adjacent minerals
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012