Chalcedony définitions

chalcedony

A cryptocrystalline form of quartz, microscopicallyfibrous with waxy luster. May be transparent or translucent, and witha uniform tint of white, gray, pale blue, and, less often, black.
Trouvé sur https://www.encyclopedie.fr/local/298

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chalcedony

Occurs in limestone, dolostone, and mudstones.
Trouvé sur https://www.encyclopedie.fr/local/298

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