Six microscopic magnifications of minerals, Cohen, c. 1880 - in or before 1885 photomechanical print Afbeelding 1 is enstatiet, 2 is olivine, 3 is nefelienbasalt, 4 is basalt, 5 is olivine en 6 is olivine. GreifswaldOffenburg paper collotype minerals and metals
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Photo credit: © piemags/rmn / Alamy / Afripics
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