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  1. A state of matter in which there is no orderly arrangement of atoms.
    Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
  2. Said of a mineral or other substance that lacks crystalline structure, or whose internal arrangement is so irregular that there is no characteristic external form. Ant. crystalline. AGI
  3. The state of a solid lacking crystal structure, specif. lacking long-range order.
  4. A term formerly used to describe a body of rock occurring in a continuous mass, without division into parts. CF: massive
    Source: Dictionary of Mining, Mineral, and Related Terms

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