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    Post  George on Sun 10 Dec 2017, 07:49

    I have just read about the diorite in the section on rocks of Minerals, Rocks & Fossils by A. C. Bishop, A. R. Woolley, and W. R. Hamilton. I gather that xenoliths are common in this rock, whose constituent mineral feldspar or hornblende may form phenocrysts and make it porphyritic.

    Everybody ought to know that geological rocks come in three varieties: igneous, metamorphic, sedimentary – and anyone who does not know this should be treated with the ridicule due to one contestant I once saw on “Eggheads” who thought Hawaii was in the Indian Ocean. Diorite, in particular, is igneous.

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    Re: Diorite

    Post  Ian on Wed 13 Dec 2017, 20:53

    The name of this rock sounds like what Prince Charles might say when he had a quarrel with his first wife. lol!

      Current date/time is Mon 10 Dec 2018, 11:29