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volcanic ash; ("Magnetic Iron oxide from Krakatoa dust"); magnetite, with orthopyroxene (hypersthene), clinopyroxene etc

Krakatoa, [Soenda Straits], [Indonesia] [26-28th August 1883] One of a set of 13 old Krakatoa and New Zealand volcanic ash microscope slides. The slides have distinctive F numbers 1-15, and unusual, tiny, circular cover slips. Labels say "F11... Magnetic Iron oxide from Krakatoa dust. Cb 7.4.84". Other slides in this set are associated with the ship Berbice, known to have been close to Krakatoa, a…