Six microscopic magnifications of minerals, Cohen, c. 1880 - in or before 1885 photomechanical print Figure 1 is Sanidine and Plagioclaas, 2 are Sanidine and phonolite, 3 are Orthoclaas and Plagioclaas, 4 is Orthoclaas, 5 is Orthocaas and 6 is Orthoclaas. GreifswaldOffenburg paper collotype minerals and metals

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