agate

Noun
  1. An impure form of quartz consisting of banded chalcedony;
    Used as a gemstone and for making mortars and pestles (synset 114732393)
    is a type of: calcedony, chalcedony - a milky or greyish translucent to transparent quartz
    subtypes: moss agate - an agate resembling moss with brown, black, or green markings

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