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Irregular shaped crystals of indeterminate crystalline form. Anhedral crystals grew in an impeded environment, such as adjacent to simultaneously growng crystals, producing a material whose characteristics used to determine crystalline form, such as plane faces, are not visible. In a rock where most of the grains are anhedral, the fabric is said to be allotriomorphic granular.

Synonyms and Related Terms

xenomorphic; allotriomorphic; anédrico (Port.); xenomórfico (Port.); alotriomórfico (Port.)

Sources Checked for Data in Record

  • Submitted information Comment: Jose Delgado Rodrigues, LNEC, 2009.
  • Walter C. McCrone, John Gustave Delly, The Particle Atlas, W. McCrone Associates, Chicago, IV, 1972