Last updated
Category Organic mineral
(repeating unit)
C5H4N4O3 · 2H2O
IMA symbol Tnn [1]
Crystal system Monoclinic
Crystal class 2/m - prismatic
Space group '
Tenacity Earthy (dull)
References [2]

Tinnunculite is a naturally-occurring form of dihydrate of uric acid. It should not be confused with a proposed mineral species with the identical name 'Tinnunculite', that forms when droppings from a European kestrel react with the burning dumps of coal mines and quarries. The name tinnunculite is derived from the kestrel's binomial name, "Falco tinnunculus", which is itself derived from the Latin word tinnunculus, meaning "kestrel", from tinnulus, meaning "shrill". [3] Tinnunculite is a naturally occurring form of the same type of origin.


The mineral is a dihydrate of uricite to which it is visually very similar. Tinnunculite is chemically similar to other organic minerals: guanine, uricite; also acetamide, kladnoite. [2] A new mineral proposal with the same name but slightly different formula (C10H12N8O8) was submitted by Chesnokov & Shcherbakova and ultimately rejected by the International Mineralogical Association (IMA) on the basis of being of anthropogenic origin. [4]


Russia: Mount Rasvumchorr, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast, Northern Region.

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  1. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID   235729616.
  2. 1 2 Mindat.org - Tinnunculite
  3. Jobling, James A (2010). The Helm Dictionary of Scientific Bird Names . London: Christopher Helm. pp.  266, 386. ISBN   978-1-4081-2501-4.
  4. "Tinnunculite (of Chesnokov & Shcherbakova)". Mindat.org. Retrieved 31 January 2017.

See also