from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of a group of feldspars being mixed sodium and potassium aluminosilicates.

from the GNU version of the Collaborative International Dictionary of English

  • n. A feldspar closely related to orthoclase, but triclinic. It is chiefly a silicate of sodium, potassium, and aluminium. Sp. gr., 2.57 -- 2.60.

from The Century Dictionary and Cyclopedia

  • n. A triclinic feldspar allied to microcline but containing a considerable amount of soda: characteristic of certain igneous rocks, as the andesite of Pantelleria.


Sorry, no etymologies found.


  • Blocks of anorthoclase - and clinopyroxene-bearing micorgaphic granophyre (click for photo) were ejected with rhyolitic pumice during a late-Pleistocene eruption at the Alid volcanic center, Eritrea.


  • Both have phenocrysts of normally zoned anorthoclase, ferroaugite, magnetite, minor quartz, zircon, sulfide and apatite.



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