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Lost Charles Darwin microscope slide set found in cardboard box on sale

A rare microscope slide with scoriaceous lava from Darwin's Beagle voyage is auctioned with a modest £500 start, expected to attract museum and collector interest.

  • On Dec. 3, Flints Auction in Newbury, Berks. will offer a microscope slide purportedly containing Scoriaceous Lava from Darwin's Beagle voyage, with a £250 starting price.
  • A vendor who bought a job lot found the slide hidden in a cardboard box among 250 insect, petrology and diatom slides at a local auction.
  • Scoriaceous lava, a rare volcanic material Darwin encountered, featured in his fieldwork and Geological Observations on the Volcanic Islands, shaping early volcanic island geology.
  • Matt Nunn, specialist at Flints Auctions, said he has never seen research material related to Darwin outside a museum and expects interest from museums and collectors since the slide is believed to be the only one publicly auctioned.
  • Long ago material from the Beagle voyage resurfaced when the job lot was inspected, linking the slide to Darwin's geological research and embodying foundations of modern volcanology.
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Lost Charles Darwin microscope slide set found in cardboard box on sale

The tiny piece of history is believed to be the only slide from Darwin's research to ever go on auction.

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Daily Post-Athenian broke the news in on Tuesday, December 2, 2025.
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