Could be so, i thrust your statement as i am no geologist and i know that you know what you do :-) conglomerate was just the term i used as its a mixed up stone....
Thats from a geologist site:
Its a type of plutonic Diorite also called Felsenmeer Diorite or on geologists term Diorit-Gabbro Family...Quartz is mostly missing <5% and the ones having more Quartz are called Quartz Diorites...here these stones can also be reddish....