from The Century Dictionary and Cyclopedia

  • In lithology, a term introduced by Rosenbusch to designate a holocrystalline structure said by him to be characteristic of certain rocks, and especially of the porphyrites, in which the ground-mass consists of slender lath-shaped microliths of feldspar, with which are frequently connected the phenomena of fluidal structure, amygdules, and the presence of minute vitreous scales.


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