1842 Hand painted lithograph with applied mica powder depicting the mineral Alexandrite Chrysoberyl and the color change it has in daylight (left) and incandescent (right). From the publication Schriften der Russisch-Kaiserligen Geselschaft für die gesammte Mineralogie zu St. Petersburg.
I am searching for more information on the 1842 publication and geologist Asbjørn Halvorsen.
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