Fig 9-1 - uploaded by William B Simmons
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Isometric block diagram showing idealized pod-shaped pegmatite with concentric zonal structure (modified from Cameron et al. 1949).
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Three distinct paragenetic and compositional types of tourmaline were described from the Velence Granite and the surrounding contact slate. Rare, pitch-black, disseminated tourmaline I (intragranitic tourmaline) occurs in granite, pegmatite, and aplite; very rare, black to greenish-gray, euhedral tourmaline II (miarolitic tourmaline) occurs in miar...
