Flint vs. Obsidian

Flint and Obsidian Definitions
Flint
A very hard, fine-grained quartz that sparks when struck with steel.
Obsidian
A usually black or banded, hard volcanic glass that displays shiny, curved surfaces when fractured and is formed by rapid cooling of lava.
Flint
A piece of flint used to produce a spark.
Obsidian
(mineral) A type of naturally occurring black glass produced by volcanoes.
Flint
A small solid cylinder of a spark-producing alloy, used in lighters to ignite the fuel.
Obsidian
A slightly bluish black, the color of obsidian glass.
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Flint
A piece of flint used as a tool by prehistoric humans.
Obsidian
(poetic) black
Flint
Something resembling flint in hardness
A jaw of flint.
Obsidian
A kind of glass produced by volcanoes. It is usually of a black color, and opaque, except in thin splinters.
Flint
A hard, fine-grained quartz that fractures conchoidally and generates sparks when struck against a material such as steel, because tiny chips of the steel are heated to incandescence and burn in air.
He used flint to make a fire.
Obsidian
Acid or granitic glass; usually dark, but transparent in thin pieces
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Flint
A piece of flint, such as a gunflint, used to produce a spark by striking it with a firestriker.
Flint
A small cylinder of some other material of the same function in a cigarette lighter, etc.
Flint
A type of maize/corn with a hard outer hull.
Flint
(figurative) Anything figuratively hard.
Flint
(transitive) To furnish or decorate an object with flint.
Flint
A massive, somewhat impure variety of quartz, in color usually of a gray to brown or nearly black, breaking with a conchoidal fracture and sharp edge. It is very hard, and strikes fire with steel.
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Flint
A piece of flint for striking fire; - formerly much used, esp. in the hammers of gun locks.
Flint
Anything extremely hard, unimpressible, and unyielding, like flint.
Flint
A hard kind of stone; a form of silica more opaque than chalcedony
Flint
A river in western Georgia that flows generally south to join the Chattahoochee River at the Florida border where they form the Apalachicola River
Flint
A city in southeast central Michigan near Detroit; automobile manufacturing