Crystals of hematite, pseudobrookite, bixbyite, and cassiterite occur in cavities within miarolitic, lithophysal rhyolite in the Black Range of southwestern New Mexico. Compositional and paragenetic relationships are compatible with the results of pertinent phase equilibrium studies, and suggest that these oxides crystallized at temperatures of 500° C or higher, probably from a gas phase present during late stages of rhyolite crystallization.

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