Six microscopic magnifications of minerals, Cohen, c. 1880 - in or before 1885 photomechanical print Figure 1 is Nefelien, 2 is Andalusite, 3 is chiastolite, 4 is sillimanite, 5 is bronziet and 6 is enstatite. GreifswaldOffenburg paper collotype minerals and metals
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Photo credit: © piemags/rmn / Alamy / Afripics
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