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Rouaite

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Svornost Mine (Einigkeit Mine), Jáchymov (St Joachimsthal), Jáchymov (St Joachimsthal) District, Krušné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic
© Brent Thorne

Show Rouaite Photos (4)

Formula:

(NO

)(OH)

System:

Monoclinic

Colour:

Dark emerald-green

Lustre:

Vitreous

Name:

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

mindat.org URL:

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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 {P1 1 2₁} {P2₁} {P1 2₁ 1}

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 Å³ (Calculated from Unit Cell)

Morphology:

Tabular on {001} or equant.

Comment:

Commonly twinned on {001}.

Optical Data of Rouaite

Type:

Biaxial (+)

RI values:

n_α = 1.700 n_β = 1.715 n_γ = 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:

(NO

)(OH)

Essential elements:

Cu, H, N, O

All elements listed in formula:

Cu, H, N, O

Relationship of Rouaite to other Species

5.NB.05

Gerhardtite

(NO

)(OH)

Other Names for Rouaite

Synonyms:

IMA1999-010

Other Languages:

German:	Rouait
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)

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Localities for Rouaite

The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the

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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
Carinthia Friesach - Hüttenberg area St Martin am Silberberg Slag localities	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 Montanwerke Brixlegg (slag locality)	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. In Niedermayr, G. et al. (2013): Neue Mineralfunde aus Österreich LXII. Carinthia II, 203./123. (in press).

Czech Republic
Bohemia (Böhmen; Boehmen) Karlovy Vary Region Krušné Hory Mts (Erzgebirge) Jáchymov (St Joachimsthal) District Jáchymov (St Joachimsthal)	RRUFF Project. Single crystal X-Ray Diffraction.
Svornost Mine (Einigkeit Mine)	Rruff project single crystal XRD.

Democratic Republic of Congo (Zaïre)
Katanga (Shaba) Katanga Copper Crescent Luambo Kalabi Mine	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 Roua Mines (Clue de Roua) (TL)	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 Clara Mine	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 Sterling Mine	Sarp, et al, Riviéra Scientifique:85:3-12, 2001 (15 Oct 2001),

Zimbabwe
Mashonaland West Kadoma District Sanyati Mine	Uwe Kolitsch collection (SXRD analysis)

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