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#magnetite #iron ore #mineral extraction #steel production #Fe3O4 #economic geology

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#mining #ore #valuable rock #mineral resource #raw material #extraction #economic geology

💎🪰⛏️

#mineralogy #petrology #mining geology #economic geology #rock collecting #crystals #geology tools

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#skarn #ore deposit #mining district #contact aureole #igneous intrusion #economic geology #mineral exploration