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    The Harvey volcanic suite, New Brunswick; II, Postmagmatic adjustments in the mineralogy and bulk composition of a high-fluorine rhyolite
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    The petrogenesis of the topaz-rich ongonite and topazite dikes in the Flying W ranch area (Tonto basin, Arizona) was investigated, and the possible origin of the topaz in the Flying W rhyolite is discussed. The field, textural geochemical, and mineralogical characteristics of the topaz-bearing dikes in the Flying W ranch area all were found to support the genesis of the topaz-bearing bodies from a magma. The evidence obtained contradicts an origin for these rock types by greisenization or veining.
    Topaz
    Dike
    Petrogenesis
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