chalcedony

Noun
  1. A milky or greyish translucent to transparent quartz (synset 114830503)
    is a type of:
    • quartz - a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities
    • transparent gem - a gemstone having the property of transmitting light without serious diffusion
    subtypes:
    • agate - an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles
    • bloodstone, heliotrope - green chalcedony with red spots that resemble blood
    • carnelian, cornelian - a translucent red or orange variety of chalcedony
    • chrysoprase - a green variety of chalcedony valued as a gemstone
    • onyx - a chalcedony with alternating black and white bands; used in making cameos
    • plasma - a green slightly translucent variety of chalcedony used as a gemstone
    • sard, sardine, sardius - a deep orange-red variety of chalcedony
    same as: calcedony

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