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#aztec
#geology
#obsidian
#glass
#science
#igneous
#conchoidal
#fracture
#sharp
#the earth story
#knife
#blade
#flint knapping
#science
#quartz
#fracture
#conchoidal
#mineral
#crystal
#electron microscope
#sandstone
#geology
#the earth story
#hardness
#mohs scale
#obsidian
#science
#geology
#weapon
#blade
#mineraloid
#glass
#volcanic
#aztec
#conchoidal
#fracture
#sharp
#the earth story
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