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Rouaite

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Formula:
Cu2(NO3)(OH)3
Colour:
Dark emerald-green
Lustre:
Vitreous
Crystal System:
Monoclinic
Name:
Named in 2001 by Halil Sarp, Radovan Černý, and Laure Guenee, after the principle co-type locality - old copper mines of Roua, Alpes-Maritimes, France.
Dimorph of:
An uncommon secondary copper nitrate.

Easy to confuse with its dimorph gerhardtite (both have very similar X-ray powder diffraction patterns). At ambient temperatures, rouaite is metastable by comparison to gerhardtite, but the transformation from rouaite to gerhardtite is strongly inhibited (Oswald, 1961).


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Classification of RouaiteHide

Approved
5.NB.05

5 : CARBONATES (NITRATES)
N : NITRATES
B : With OH
Dana 7th ed.:
19.1.2.1

Physical Properties of RouaiteHide

Vitreous
Colour:
Dark emerald-green
Streak:
clear green

Optical Data of RouaiteHide

Type:
Biaxial (+)
RI values:
nα = 1.700 nβ = 1.715 nγ = 1.738
2V:
Measured: 81° , Calculated: 80°
Max Birefringence:
δ = 0.038
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v strong

Chemical Properties of RouaiteHide

Formula:
Cu2(NO3)(OH)3
IMA Formula:
Cu2NO3(OH)3

Crystallography of RouaiteHide

Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P21
Cell Parameters:
a = 5.596(2) Å, b = 6.079(2) Å, c = 6.925(3) Å
β = 94.67(2)°
Ratio:
a:b:c = 0.921 : 1 : 1.139
Unit Cell V:
234.79 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Tabular on {001} or equant.
Comment:
Commonly twinned on {001}.

Type Occurrence of RouaiteHide

Synonyms of RouaiteHide

Other Language Names for RouaiteHide

German:Rouait
Simplified Chinese:单斜铜硝石
Spanish:Rouaita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Cuprite3 photos of Rouaite associated with Cuprite on mindat.org.
Gerhardtite1 photo of Rouaite associated with Gerhardtite on mindat.org.
Connellite1 photo of Rouaite associated with Connellite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

5.NB.05GerhardtiteCu2(NO3)(OH)3Orth. 2 2 2 : P21 21 21

Other InformationHide

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

References for RouaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Oswald, H.R. (1961): Über natürlichen und künstlichen Gerhardtit. Zeits. Krist., 116, 210-219. (in German with English abs.)
Effenberger, H. (1983): Verfeinerung der Struktur des monoklinen Dikupfer(II)-trihydroxi-nitrates Cu2(NO3)(OH3). Z. Kristallogr. 165, 127-135 (in German).
Guillou, N., Louër, M. and Louër, D. (1994): An X-ray and neutron powder diffraction study of a new polymorphic phase of copper hydroxide nitrate. J. Solid State Chem. 109, 307-314.
Sarp, H., Černý, R. & Guenee, L. (2001): Rouaite, Cu2(NO3)(OH)3, un nouveau minéral: sa description et sa structure cristalline (Alpes-Maritimes, France). Riv. Scientifique 85, 3-12 (in French).
American Mineralogist (2002): 87: 998.
C. H. Yoder, E. Bushong, X. Liu, V. Weidner, P. McWilliams, K. Martin, J. Lorgunpai, J. Haller and R. W. Schaeffer (2010): The synthesis and solubility of the copper hydroxyl nitrates, gerhardtite, rouaite and likasite. Mineral. Mag. 74, 433-440.

Internet Links for RouaiteHide

Localities for RouaiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Austria
 
  • Carinthia
    • Friesach - Hüttenberg area
      • St Martin am Silberberg
Kolitsch, U. (2012): 1717) Rouait aus den Schlackenhalden von St. Martin am Silberberg, Saualpe, Kärnten. Pp. 126-127 in Niedermayr, G. et al. (2012): Neue Mineralfunde aus Österreich LXI. Carinthia II, 202./122., 123-180.
  • Tyrol
    • North Tyrol
      • Inn valley
        • Brixlegg - Schwaz area
Kolitsch, U. (2013): 1799) Anglesit, Brochantit, Calcit, Callaghanit, Connellit, Cuprit, Diopsid, Elyit, Forsterit, Kupfer, Lithargit, Magnesiochromit, Malachit, Monohydrocalcit, Phoenicochroit, Rouait und Willemit in Schlacken der Montanwerke Brixlegg, Tirol. Pp. 111-114 in Niedermayr, G. et al. (2013): Neue Mineralfunde aus Österreich LXII. Carinthia II, 203./123., 91-146.
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Karlovy Vary Region
      • Krušné Hory Mts (Erzgebirge)
        • Jáchymov District (St Joachimsthal)
RRUFF Project. Single crystal X-Ray Diffraction.
Rruff project single crystal XRD.
Democratic Republic of Congo (Zaïre)
 
  • Katanga (Shaba)
    • Katanga Copper Crescent
      • Luambo
Oswald, H.R. (1961): Über natürlichen und künstlichen Gerhardtit. Zeitschrift für Kristallographie, 116, 210-219.
France (TL)
 
  • Provence-Alpes-Côte d'Azur
    • Alpes-Maritimes
      • Guillaumes
        • Daluis
Sarp, H., & Cerný, R. & Guenee, L. (2001): Rouaite, Cu2(NO3)(OH)3, un nouveau minéral: sa description et sa structure cristalline (Alpes-Maritimes, France). Riv. Scientifique 85, 3-12.
Germany
 
  • Baden-Württemberg
    • Black Forest
      • Wolfach
        • Oberwolfach
          • Rankach valley
U. Kolitsch, J. Gröbner, F. Brandstätter and R. Bayerl (2010): Neufunde aus der Grube Clara im mittleren Schwarzwald (IV): Calcioandyrobertsit, Cotunnit, Gerhardtit, Khaidarkanit, Lukrahnit, Mckinstryit, Moolooit, Rhabdophan-(La), Rouait und Uricit. Lapis 35 (9), 22-27; 62 (in German).
USA (TL)
 
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Ogdensburg
          • Sterling Hill
Sarp, et al, Riviéra Scientifique:85:3-12, 2001 (15 Oct 2001),
Zimbabwe
 
  • Mashonaland West
    • Kadoma District
Uwe Kolitsch collection (SXRD analysis)
Mineral and/or Locality  
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