Wrote Letter L-416 of 1704-02-01 to the members of the Royal Society about red sandstone from the cathedral at Utrecht compared to diamond, his theory about the origin of diamonds, and marble, Bentheim stone, alabaster, and gold and silver ore

February 1, 1704
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Text of the letter in the original Dutch and in English translation from Alle de Brieven. The Collected Letters at the DBNL - De Digitale Bibliotheek voor de Nederlandse Letteren

Leeuwenhoek wrote this letter about …

The structure of grains of sand from red stone of the Cathedral in Utrecht. Comparing it to diamond. A theory on the origin of diamond. The structure of grains of sand from marble, Bentheim stone, and alabaster. Gold from a mineral originating from Sumatra.