La piedrita, en inglés se llama "flint":
"The sparks generated are in fact tiny pieces of burning metal."
"Lighter "flint" is composed mostly of rare earth metals, usually cerium or mischmetal, whose low ignition temperatures (150 to 180 degrees celsius) are the chemical origin of its easy sparking. Since smaller scrapings become better sparks, the mechanical properties of rare earth metals must be adjusted to give a usable material"
Si che, tiene POLVORA
CHAMUYEROOOOO



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