Plenty of outstanding yellow crystals of the rare organic mineral kladnoite from the TL in Kladno (Kladno Mine, Libušin, Kladno, Central Bohemian Region, Czech Republic). Ex. Erich Laskowski collection (USA). — Photo: David Hospital · CC BY 4.0
Kladnoite
Kladnoite is an IMA-recognized mineral species in the organic mineral class, with the chemical formula C₆H₄(CO)₂NH.
It crystallizes in the monoclinic crystal system (space group P2_1/n).
Key properties: specific gravity 1.47; optically biaxial.
IMA symbol Kdn, grandfathered status — known before the IMA’s founding, named in 1942.
Formed as a result of fires in coal heaps.
The name refers to its occurrence in the Kladno district, Czech Republic.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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