from The Century Dictionary and Cyclopedia

  • n. In petrography, a somewhat altered spherulitic quartz-porphyry or rhyolite (Monteiro). This name, first applied by Haüy to the orbicular diorite of Corsica (corsite or napoleonite), was given because it was thought that only a part of the minerals in the rock was fusible, quartz being at that time considered infusible.


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