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Rouaite

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Formula:
Cu2(NO3)(OH)3
System:
Monoclinic
Colour:
Dark emerald-green
Lustre:
Vitreous
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).

Classification of Rouaite

Approved
5.NB.05

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

Physical Properties of Rouaite

Vitreous
Colour:
Dark emerald-green
Streak:
clear green

Crystallography of Rouaite

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 Volume:
V 234.79 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Tabular on {001} or equant.
Comment:
Commonly twinned on {001}.

Optical Data of Rouaite

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 Rouaite

Formula:
Cu2(NO3)(OH)3
Essential elements:
All elements listed in formula:

Relationship of Rouaite to other Species

Other Names for Rouaite

Name in Other Languages:
German:Rouait
Simplified Chinese:单斜铜硝石
Spanish:Rouaita

Other Information

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 Rouaite

Reference List:
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 Rouaite

Localities for Rouaite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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
 
  • 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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