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  1. A faintly foliated metamorphic rock developed during regional metamorphism of simatic rocks. Composed mainly of hornblende and plagioclase feldspars.
    Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
  2. A crystalloblastic rock consisting mainly of amphibole and plagioclase with little or no quartz. As the content of quartz increases, the rock grades into hornblende plagioclase gneiss. CF: feather amphibolite AGI
    Source: Dictionary of Mining, Mineral, and Related Terms

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