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Rouaite

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Formula:
Cu
 
2
(NO
 
3
)(OH)
 
3
System:MonoclinicColour:Dark emerald-green
Lustre:Vitreous
Name:Named in 2001 by Halil Sarp, Radovan Černý, and Laure Guenee, after the type locality - old copper mines of Roua, Alpes-Maritimes, France.
Dimorph of:Gerhardtite


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

IMA status:Approved
Strunz 8th edition ID:5/A.03-15
Nickel-Strunz 10th (pending) edition ID:5.NB.05

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

Type Locality:Roua Mines (Clue de Roua), Daluis, Guillaumes, Alpes-Maritimes, Provence-Alpes-Côte d'Azur, France

Physical Properties of Rouaite

Lustre: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°
Maximum Birefringence:δ = 0.038

Chart 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:
Cu
 
2
(NO
 
3
)(OH)
 
3
Simplified for copy/paste:Cu2(NO3)(OH)3
Essential elements:Cu, H, N, O
All elements listed in formula:Cu, H, N, O

Relationship of Rouaite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
5.NB.05Gerhardtite
Cu
 
2
(NO
 
3
)(OH)
 
3

Other Names for Rouaite

Synonyms:
IMA1999-010
Other Languages:
German:Rouait
Simplified Chinese:单斜铜硝石
Spanish:Rouaita

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 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

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Rouaite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Localities for Rouaite

    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.
    (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
     
    • 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
     
    • 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
     
    • 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)
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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