🪨🔥

#flint #chert #fire starting #prehistoric tools #cryptocrystalline #conchoidal fracture

🔨🪨⛏️

#flint knapping #stone tool #prehistoric tool #lithic technology #arrowhead #chert

🪲SiO₂

#silica #silicon dioxide #chert #flint #mineralogy #cryptocrystalline quartz

🪨🔪🏹

#chert #flint #arrowhead #stone tool #knapping #prehistoric weapon #rock tool

🪨🔬

#chert #microcrystalline #cryptocrystalline #silica #sedimentary rock #petrology #rock structure

⏳💎🧁

#radiolaria #microfossil #siliceous ooze #ocean sediment #fossil record #chert #plankton skeleton