moss agate(redirected from Montana moss agate)
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moss agate:see agateagate
, translucent, cryptocrystalline variety of quartz and a subvariety of chalcedony. Agates are identical in chemical structure to jasper, flint, chert, petrified wood, and tiger's-eye, and are often found in association with opal.
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moss agate[′mȯs ′ag·ət]
A milky or almost transparent chalcedony containing dark inclusions in a dendritic pattern.