the.com/chert
sedimentary stone so sharp our ancestors knapped empires from it
made ofmicroscopic quartz crystals packed invisibly tight
stone age MVPshaped into blades, scrapers, arrowheads for millennia
flint cousinflint is just chert formed in chalk
strikes firesparks against steel to ignite tinder
silica sourceoften built from dissolved ancient marine plankton