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Dark emerald-green
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


B : With OH
Dana 7th ed.:

Physical Properties of Rouaite

Dark emerald-green
clear green

Optical Data of Rouaite

Biaxial (+)
RI values:
nα = 1.700 nβ = 1.715 nγ = 1.738
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:
r > v strong

Chemical Properties of Rouaite

IMA Formula:
Elements listed in formula:

Crystallography of Rouaite

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

Type Occurrence of Rouaite

Relationship of Rouaite to other Species

Other Names for Rouaite

Name in Other Languages:
Simplified Chinese:单斜铜硝石

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 URL:
Please feel free to link to this page.

Localities for Rouaite

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.
(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.
  • 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.
  • 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).
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Ogdensburg
          • Sterling Hill
Sarp, et al, Riviéra Scientifique:85:3-12, 2001 (15 Oct 2001),
  • Mashonaland West
    • Kadoma District
Uwe Kolitsch collection (SXRD analysis)
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