As personalized stamps, a stamps on minerals were issued in the Netherlands in 2023. On January 2, 2023, a stamp on the mineral "Margarosanite" was issued. Its chemical formula is Pb(Ca,Mn²⁺)₂Si₃O₉. The color of the mineral is described as colorless or pearly white. On the stamp, however, the name was incorrectly imprinted as "Margaronasite" instead of "Margarosanite". A corrected stamp was issued on March 2, 2023.