Marchettiite is an organic ammonium hydrogen urate formed by circulation of meteoric waters at low temperatures, and enriched with soluble altered biological material. This mineral is essentially a molecule of ammonia combined with a molecule of uric acid, with biological origins that can be traced to the urine or feces of a bird or other animal. Type material is deposited in the collections of the Museum of Mineralogy, University of Padova, Via Giotto 1, I-35122, Padova, Italy, catalogue number MMP M17892.

Read more about marchettiite: Marchettiite joins the New Carbon Mineral Roster as #13