What is a chalcedony?

What is a chalcedony? Here are some definitions.

Noun
  1. A form of fine-grained quartz that is nearly transparent or has a milky translucence; it fractures conchoidally.
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Examples
Plasma is sometimes considered a green variety of jasper, and sometimes considered as a green and translucent variety of chalcedony.
The matrix is composed of microgranular quartz with some fibrous chalcedony.
The most spectacular inclusions are bands of native copper that are in and follow the chalcedony concentric banding of the agate.
These include Neolithic tools made from chalcedony as well as nephrite objects from Ancient China.
The Brushy Basin sediments contain numerous chalcedony pseudomorph-after-barite concretions that range to more than 30 cm in diameter.
The coarsely crystalline veins are composed predominantly of colorless barite and quartz and white chalcedony.

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