Rouaite Mineral Data

General Rouaite Information

Chemical Formula:

Cu2(NO3)(OH)3

Composition:

Molecular Weight = 240.12 gm

Copper 52.93 % Cu 66.25 % CuO

Hydrogen 1.26 % H 11.25 % H₂O

Nitrogen 5.83 % N 22.49 % N₂O₅

Oxygen 39.98 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu₂(NO₃)(OH)₃

Environment:

Secondary mineral formed in mines where Cu can react with nitrates from the organism nitrobactor. Dimorph of gerhardtite

IMA Status:

Approved IMA 1999 (Dana # Added)

Locality:

Old copper mines at Roua, Alpes-Maritimes, southeastern France. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

IMA1999-010

Rouaite Crystallography

Axial Ratios:

a:b:c =0.9205:1:1.1391

Cell Dimensions:

a = 5.596, b = 6.079, c = 6.925, Z = 2; beta = 94.67° V = 234.79 Den(Calc)= 3.40

Crystal System:

Monoclinic - Sphenoidal H-M Symbol (2) Space Group: P 2₁

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 6.91(1)(001), 3.457(0.9)(111,002), 2.462(0.8)(121),2.669(0.8)(120), 2.078(0.5)(122,103), 2.25(0.5)(202), 2.154(0.4)(013),

Physical Properties of Rouaite

Cleavage:

{001} Perfect

Color:

Dark emerald green.

Density:

3.38

Diaphaneity:

Transparent

Fracture:

Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Equant Grains - Granular material with equel dimensions in x, y, and z.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Luster:

Vitreous (Glassy)

Streak:

green

Optical Properties of Rouaite

Gladstone-Dale:

CI meas= -0.034 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.028 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2111,KPDmeas= 0.2123,KC= 0.2053
Ncalc = 1.69 - 1.7

Optical Data:

Biaxial (+), a=1.7, b=1.715, g=1.738, bire=0.0380, 2V(Calc)=80, 2V(Meas)=81. Dispersion r > v strong.

Calculated Properties of Rouaite

Electron Density:

Bulk Density (Electron Density)=3.29 gm/cc
note: Specific Gravity of Rouaite =3.40 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_Rouaite= 23.19 barns/electron
U=PE_Rouaite x rElectron Density= 76.18 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rouaite is Not Radioactive

Rouaite Classification

Dana Class:

19.01.01.02 (19)Nitrates - Hydroxyl or Halogen

(19.01)with miscellaneous formulae

(19.01.01)Dana Group

19.01.01.01 Gerhardtite Cu2(NO3)(OH)3 P 2₁2₁2₁ 2 2 2

19.01.01.02 Rouaite! Cu2(NO3)(OH)3 P 2₁ 2

Strunz Class:

05.NB.05 05 - CARBONATES (NITRATES)

05.N - NITRATES

05.NB -With OH

05.NB.05 Gerhardtite Cu2(NO3)(OH)3 P 2₁2₁2₁ 2 2 2

05.NB.05 Rouaite! Cu2(NO3)(OH)3 P 2₁ 2

Other Rouaite Information

References:

NAME( AmMin, vol 87, p 998) PHYS. PROP.(AmMin, vol 87, p 998) OPTIC PROP.(AmMin, vol 87, p 998)

See Also:

Links to other databases for Rouaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Print or Cut-and-Paste your Rouaite Specimen Label here :

Rouaite

Cu2(NO3)(OH)3
Dana No: 19.01.01.02 Strunz No: 05.NB.05
Locality:

Notes:

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