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When sifting through old boxes or stacks of vintage papers, one often uncovers nostalgic relics from the past. But occasionally, these discoveries are far more valuable. Such was the case at the Bavarian Environment Agency (LfU) in Germany. While employees were digitizing their historic mineral collection of 130,000 exhibits, they stumbled upon one of the "rarest minerals on Earth." A handwritten letter in a drawer revealed the name of the mineral—Humboldtine. The LfU shared the details in a January 2024 press release, noting that more information would be published in Geologica Bavarica.

According to Mindat, an online mineral and rock database, humboldtine is “a rare authigenic mineral from the mineral class of organic compounds with the chemical composition Fe2+(C2O4)·2H2O.” It is a water-containing iron salt of oxalic acid, with color ranging in shades of yellow, mostly amber-yellow or lemon-yellow. With crystals small and prismatic, humboldtine forms when carbon compounds and iron-oxide react with water.