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.

Some of the enormous fragments of chalk which are interstratified with drift have not only layers of undisturbed flints, but also sandpipes in the middle of them, or cylindrical cavities filled with sand and gravel […]

A piece of flint, such as a gunflint, used to produce a spark by striking it with a firestriker.

He used a flint to make a fire.

A small cylinder of some other material of the same function in a cigarette lighter, etc.

A variety of maize/corn with a hard outer hull.

Anything figuratively hard.

To furnish or decorate an object with flint.

No schoolboys lingered round Bob Robertson's (yclept Roberson's) blacksmith's shop, for this sleepy day no lusty throat bellowed attention to the flaming tongues fanned from its bloodily blazing teeth; no luminous stars flinted from the clanking anvil.

No change from the primordial doth appear, / Within the earth’s rotation of the year, / Nor are ye heirless of her sane decree, / The problem is potentiality / Of Spring and Autumn, burdenful with Fate, / Upon the seeds of labour ye must wait, / Sowing the Consequence by which ye came, / Flinting the fire not to fire but flame, / With all the end of Destiny the same!

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Each one claimed they were unjustly criticized, while claiming to have had Flint residents in mind.

Remember that so many of us click on links to CashApps, Venmos, PayPals, etc. to donate to bail funds, Flint Water reliefs, the next Ferguson, and the like without any thought of integrating ourselves into collective action?