Parnauite Mineral Data

General Parnauite Information

Chemical Formula:

Cu9(AsO4)2(SO4)(OH)10•7(H2O)

Composition:

Molecular Weight = 1,242.00 gm

Copper 46.05 % Cu 51.84 % Cu₂O

Arsenic 12.06 % As 18.51 % As₂O₅

Hydrogen 1.95 % H 17.41 % H₂O

Sulfur 2.58 % S 6.45 % SO₃

Oxygen 37.36 % O

______ ______

100.00 % 94.20 % = TOTAL OXIDE

Empirical Formula:

Cu₉(AsO₄)₂(SO₄)(OH)₁₀•7(H₂O)

IMA Status:

Approved IMA 1978

Locality:

Majuba Hill mine, Pershing County, Nevada, USA. Link to MinDat.org Location Data.

Name Origin:

Named for John L. Parnau (1906-1990), U.S. Mineral collector who discovered the mineral.

Name Pronunciation:

Parnauite + Pronunciation

Parnauite Image

Images:

Parnauite

Comments: Green tabular crystals of parnauite.
Location: Graul, Schwarzenberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 1 mm.
© Thomas Witzke / Abraxas-Verlag

Parnauite Crystallography

Axial Ratios:

a:b:c =1.0532:1:0.4231

Cell Dimensions:

a = 14.98, b = 14.223, c = 6.018, Z = 2; V = 1,282.20 Den(Calc)= 3.22

Crystal System:

Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: P 2₁22

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

By Intensity(I/I_o): 14.3(1), 4.52(0.6), 10.38(0.24),

Physical Properties of Parnauite

Cleavage:

{???} Good

Color:

Blue green, Green, Light blue.

Density:

3.09

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Rosette - Bundled tabular aggregates resembling rose flower petals.

Habit:

Scaly - Morphology like fish scales.

Hardness:

2 - Gypsum

Streak:

greenish white

Optical Properties of Parnauite

Gladstone-Dale:

CI meas= -0.019 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.022 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.217,KPDmeas= 0.2261,KC= 0.2219
Ncalc = 1.69 - 1.71

Optical Data:

Biaxial (-), a=1.68, b=1.704, g=1.712, bire=0.0320, 2V(Calc)=58, 2V(Meas)=60.

Pleochroism (x):

pale green.

Pleochroism (y):

yellow green.

Pleochroism (z):

blue green.

Calculated Properties of Parnauite

Electron Density:

Bulk Density (Electron Density)=2.98 gm/cc
note: Specific Gravity of Parnauite =3.09 gm/cc.

Fermion Index:

Fermion Index = 0.0003758749
Boson Index = 0.9996241251

Photoelectric:

PE_Parnauite= 28.42 barns/electron
U=PE_Parnauite x rElectron Density= 84.70 barns/cc.

Radioactivity:

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

Parnauite Classification

Dana Class:

43.05.13.01 (43)Compound Phosphates, etc.

(43.05)(Hydrated Compound Anions With Hydroxyl or Halogen)

(43.05.13)Dana Group

43.05.13.01 Parnauite Cu9(AsO4)2(SO4)(OH)10•7(H2O) P 2₁22 2 2 2

Strunz Class:

08.DF.35 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DF -With only medium-sized cations, (OH,etc.):RO4 > 3:1

08.DF.35 Parnauite Cu9(AsO4)2(SO4)(OH)10•7(H2O) P 2₁22 2 2 2

Other Parnauite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

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

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

Parnauite

Cu9(AsO4)2(SO4)(OH)10•7(H2O)
Dana No: 43.05.13.01 Strunz No: 08.DF.35
Locality:

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