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Chalcedony vs. Chert: What's the Difference?

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.
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Chert

Massive, usually dull-colored and opaque, quartzite, hornstone, impure chalcedony, or other flint-like mineral.

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
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