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Unnamed (Uric Acid Dihydrate)

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Formula:
C
 
5
H
 
4
N
 
4
O
 
3
 · 2H
 
2
O


A naturally occurring dihydrate of uricite (uric acid).

Well-known rare component of urinary and other stones.

Classification of Unnamed (Uric Acid Dihydrate)

IMA status:Not Approved
mindat.org URL:http://www.mindat.org/min-39866.html
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Chemical Properties of Unnamed (Uric Acid Dihydrate)

Formula:
C
 
5
H
 
4
N
 
4
O
 
3
 · 2H
 
2
O
Essential elements:C, H, N, O
All elements listed in formula:C, H, N, O

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Unnamed (Uric Acid Dihydrate)

Reference List:

- +
Ringertz, H. (1965): Optical and crystallographic data of uric acid and its dihydrate. Acta Crystallogr. 19, 286-287.

Lonsdale, K. & Mason, P. (1966): Uric acid, uric acid dihydrate, and urates in urinary calculi, ancient and modern. Science 152, 1511-1512.

Shirley, R. (1966): Uric acid dihydrate: Crystallography and identification. Science 152, 1512-1513.

Lonsdale, K. & Sutor, D. J. (1971): Uric acid dihydrate in bird urine. Science 172, 958-959.

Hesse, A.; Schneider, H. J.; Berg, W.; Hienzsch, E. (1975): Uric acid dihydrate as urinary calculus component. Investigative Urology 12, 405-409.

Yong Go, K.; Boerner, R. H.; Berg, W.; Schneider, H. J. (1980): Stabilization factors for uric acid dihydrate - a contribution to urine stone formation. Jenaer Harnsteinsymposium 6, 71-74 (in German).

Dosch, W. (1981): New urates (II): uric acid and uric acid dihydrate. Fortschritte der Urologie und Nephrologie 17, 254-264 (in German).

Boistelle, R. & Rinaudo, C. (1981): Phase transition and epitaxies between hydrated orthorhombic and anhydrous monoclinic uric acid crystals. Journal of Crystal Growth 53, 1-9.

Babic-Ivancic, V., Furedi-Milhofer, H., Brown, W. E. & Gregory, T. M. (1987): Precipitation diagrams and solubility of uric acid dihydrate. Journal of Crystal Growth 83, 581-587.

Artioli, G., Galli, E. & Ferrari, M. (1993): Uric acid dihydrate - a new mineral? Rivista Mineralogica Italiana (4), 261-264 (in Italian).

Artioli, G., Masciocchi, N. and Galli, E. (1997): The elusive crystal structure of uric acid dihydrate: implication for epitaxial growth during biomineralization. Acta Crystallogr. B53, 498-503.

Parkin, S. & Hope, H. (1998): Uric acid dihydrate revisited. Acta Crystallogr. B54, 339-344.

Zellelow, A. Z., Kim, K.-H., Sours, R. E. & Swift, J. A. (2010): Solid-state dehydration of uric acid dihydrate. Cryst. Growth Des., 10, 418-425.

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    • Localities for Unnamed (Uric Acid Dihydrate)

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Austria
     
    • Salzburg
      • Hohe Tauern
        • Gastein valley
          • Naßfeld valley
            • Sportgastein
    		Kolitsch, U. & Raade, G. (2011): Uric acid dihydrate: occurrences in Austria and Norway. Norsk Bergverksmuseum Skrift. 46: 25-29
        • Rauris valley
          • Hüttwinkl valley
            • Alteck - Hoher Sonnblick area
              • Kolm-Saigurn
    		Kolitsch, U. & Habel, M. (2012): 1752) Harnsäuredihydrat von der Hüttwinkelache bei Kolm Saigurn, Rauris, Salzburg. Pp. 157 in Niedermayr, G. et al. (2012): Neue Mineralfunde aus Österreich LX. Carinthia II, 202./122., 123-180.
    Italy
     
    • Emilia-Romagna
      • Modena Province
    		Artioli, G., Galli, E. & Ferrari, M. (1993): Uric acid dihydrate - a new mineral? Rivista Mineralogica Italiana (4), 261-264 (in Italian).
    Norway
     
    • Buskerud
      • Modum
        • Åmot
    		Kolitsch, U. & Raade, G. (2011): Uric acid dihydrate: occurrences in Austria and Norway. Norsk Bergverksmuseum Skrift. 46: 25-29
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