Chalcedony vs. Chert

Chalcedony and Chert Definitions
Chalcedony
A translucent to transparent milky or grayish quartz with distinctive microscopic crystals arranged in slender fibers in parallel bands.
Chert
A variety of silica that contains microcrystalline quartz.
Chalcedony
A form of fine-grained quartz that is nearly transparent or has a milky translucence; it fractures conchoidally.
Chert
A siliceous rock of chalcedonic or opaline silica occurring in limestone.
Chalcedony
A cryptocrystalline, translucent variety of quartz, having usually a whitish color, and a luster nearly like wax.
Chert
Massive, usually dull-colored and opaque, quartzite, hornstone, impure chalcedony, or other flint-like mineral.
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Chalcedony
A milky or grayish translucent to transparent quartz
Chert
(countable) A flint-like tool made from chert.
Chert
An impure, massive, flintlike quartz or hornstone, of a dull color.
Chert
Variety of silica containing microcrystalline quartz