greenstone definition

  • noun:
    • Any of various changed standard igneous stones coloured green by chlorite, hornblende, or epidote.
    • some of a number of green-hued nutrients utilized for making various artefacts in early Mesoamerican countries, e.g. greenschist, chlorastrolite, serpentine, omphacite, or chrysoprase
    • the green-hued minerals of brand new Zealand used by Māori to help make tools, ornaments and weapons (any one of three types of nephrite jade or one variety of bowenite)
    • A name formerly used rather loosely to specific dark-colored igneous stones, including diorite, diabase, etc.
    • Any one of numerous stones, of eruptive origin, generally more than the Tertiary, crystalline-granular in texture, and of a dark-greenish shade.
    • an extremely tough and close-textured stone employed for placing the very last edge on lancets as well as other fine medical tools, etc.
    • A name in New Zealand for several varieties of jade, especially for pounamu or nephrite, discovered chiefly on the west shore of Middle Island: formerly much employed by the Maoris for weapons, implements, and ornaments.

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