 The Incapillo ignimbrite contains xenoliths with sizes of 0 @.@ 5 – 4 centimetres ( 0 @.@ 20 – 1 @.@ 57 in ) formed by <unk> . <unk> crystals are enclosed in <unk> plagioclase crystals and sometimes contain secondary biotite crystals . <unk> is the dominant component . 
