psephite
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psephite
(ˈsiːfaɪt)n
(Geological Science) any rock, such as a breccia, that consists of large fragments embedded in a finer matrix
[C19: via French from Greek psēphos a pebble]
psephitic adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014