Altered stone

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  1. Said of a stone that has undergone chemical and/or mineralogical changes under geologic processes.
  2. Any stone of which the appearance, esp. the color, has been changed by any artificial means whatsoever. For example, heat is often used to improve or alter color. Such change may be either external or internal. See also: treated stone; stained stone.
    Source: Dictionary of Mining, Mineral, and Related Terms


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