Last week David Levy asked about coins showing chemical elements or chemistry concepts. Here's what readers came up with. Pabitra Saha offered this Russian 1 Rouble picturing chemist and periodic table inventor Dimitri Mendeleyev. -Editor

"The Austrian Niobium coins issued yearly denotes several chemistry equations on their 2022 Extraterrestrial 25 Euro coin."

"There is a 1967 10 Zlotys coin of Poland, 28 mm., copper-nickel, honoring Marie Sklodowska-Curie. These were struck for circulation, and are listed on a website for $3. Y-59

"A French 500 Francs banknote depicts Marie and Pierre Curie, with Pierre somewhat in the background. The reverse shows a lab scene. These may have been issued in several series. The colors are quite attractive. Pick #160

"The Royal Mint issued a 50 Pence commemorative coin to honor the centennial of Rosalind Franklin's birth. These were available in gold and silver, but also as circulation strikes. The coin features an impression intended to represent her crucial Photograph 51 in the discovery of the DNA double helix. It doesn't compensate for missing out on a share of the Nobel Prize, but it's something.

"Russia honored Dmitri Mendeleev, creator of the first periodic table of elements, on a 2 Rubles coin in 2009. The commemorative side has a fairly attractive portrait and five chemical symbols with atomic numbers. The other side, listed as the obverse, shows the stereotypical Russian eagle and inscription. These are 0.925 silver, 17 grams, and don't seem to sell for much more than bullion value. A 1984 Ruble commemorates the 150th anniversary of Mendeleev's birth. Copper-nickel, 31 mm., mintage nearly 2 million, Y-194.1."

Thanks, everyone. I'm sure many others would turn up in a more extensive search, and there would be additional pickings in the field of medals. Nobel Prize for Chemistry, perhaps? -Editor