xenoblast


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xen·o·blast

 (zĕn′ə-blăst′, zē′nə-)
n.
A metamorphic mineral that does not have characteristic mineral faces due to the conditions in which it grew.

xenoblast

(ˈzɛnəʊˌblæst)
n
(Geological Science) geology a type of mineral deposit formed during metamorphism that does not have a crystalline face