Chalcedony vs. Chert

A translucent to transparent milky or grayish quartz with distinctive microscopic crystals arranged in slender fibers in parallel bands.

A variety of silica that contains microcrystalline quartz.

A form of fine-grained quartz that is nearly transparent or has a milky translucence; it fractures conchoidally.

A siliceous rock of chalcedonic or opaline silica occurring in limestone.

A cryptocrystalline, translucent variety of quartz, having usually a whitish color, and a luster nearly like wax.

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

A milky or grayish translucent to transparent quartz

(countable) A flint-like tool made from chert.

An impure, massive, flintlike quartz or hornstone, of a dull color.

Variety of silica containing microcrystalline quartz