graystone definition

  • noun:
    • a form of grey, volcanic rock, usually containing feldspar and iron
    • A building manufactured from any grey rock, eg limestone
    • A grayish or greenish compact stone, composed of feldspar and augite, and allied to basalt.
    • In geology, a grayish or greenish lightweight volcanic stone, consists of feldspar and augite or horn-blende, and allied to basalt.

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