hand holding psilomelane rock hard black manganese oxides including hollandite and romanechite

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Geologist's hand is holding a specimen of raw Psilomelane mineral stone Royalty Free Stock Photo
Hand is holding a Psilomelane rock. A hard black manganese oxides including hollandite and romanechite. Royalty Free Stock Photo
   
   
   
   
   
Hand is holding a Psilomelane rock. A hard black manganese oxides including hollandite and romanechite.
   
   
   
   
   
   
   
A rock is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. Rocks are generally made up of two of more minerals, mixed up through geological processes.

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