Six microscopic magnifications of minerals, Cohen, c. 1880 - in or before 1885 photomechanical print Figure 1 is leuciet, 2 is perovskiet, 3 is titanite, 4 is rutile, 5 is a zirconium crystal and 6 is melitite. GreifswaldOffenburg paper collotype minerals and metals
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Photo credit: © piemags/rmn / Alamy / Afripics
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