!!Egon Althaus

[Obituary|https://www.dmg-home.org/dmg-home/artikel/?tx_news_pi1%5Baction%5D=detail&tx_news_pi1%5Bcontroller%5D=News&tx_news_pi1%5Bnews%5D=191&cHash=ebdf9771a2c8aa8c413cd178460074a2], Deutsche Mineralogische Gesellschaft (DMG) (in German)