 | | Book | | Generally it is of the black iron-rich variety called schorl. Topaz and fluorite are also found, although more...albite which is sometimes an essential mineral: schorl, musco¬ vite, beryl, topaz, cassiterite, albite...granite. For example, the Ment porphyritic granite, Morocco (p. 65), grades towards its margins into a microgranite...The sketches of embrechites of the SaintEtienne region of France given by A. Demay (1942) illustrate some...CIRCUMSCRIBED MASSIFS The Ouïmes batholith, in Central Morocco, with an area of 10 km by 5 km, has a concordant | | | Book | | Generally it is of the black iron-rich variety called schorl. Topaz and fluorite are also found, although more...albite which is sometimes an essential mineral: schorl, muscovite, beryl, topaz, cassiterite, albite,...granite. For example, the Ment porphyritic granite, Morocco (p. 65), grades towards its margins into a microgranite...The sketches of embrechites of the SaintEtienne region of France given by A. Demay (1942) illustrate some...CIRCUMSCRIBED MASSIFS The Oulmes batholith, in Central Morocco, with an area of 10 km by 5 km, has a concordant |
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