Parnauite Mineral Data

Parnauite Mineral Data +

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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.

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 - DisphenoidalH-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

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:

r_electron=2.98 gm/cc
note: r_Parnauite=3.09 gm/cc.

Fermion Index

Fermion Index = 0.00037
Boson Index = 0.99963

Photoelectric:

PE_Parnauite= 28.42 barns/electron
U=PE_Parnauite x r_electron= 84.70 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Parnauite is Not Radioactive

Parnauite Classification

Dana Class:

43.5.13.1 (43)Compound Phosphates, etc.

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

(43.5.13)Dana Group

43.5.13.1 Parnauite Cu9(AsO4)2(SO4)(OH)10·7(H2O) P 2₁22 2 2 2

Strunz Class:

VII/D.20-30 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.20 - Zapatalite - Chalcophyllite series

VII/D.20-10 Zapatalite Cu3Al4(PO4)3(OH)9·4(H2O) Unk Tetra

VII/D.20-20 Ceruleite Cu2Al7(AsO4)4(OH)13·12(H2O) P1 1

VII/D.20-30 Parnauite Cu9(AsO4)2(SO4)(OH)10·7(H2O) P 2₁22 2 2 2

VII/D.20-35 Leogangite! Cu10(AsO4)4(SO4)(OH)6·8(H2O) C 2/c 2/m

VII/D.20-40 Liroconite Cu2Al(AsO4)(OH)4·4(H2O) I2/a 2/m

VII/D.20-50 Chalcophyllite Cu18Al2(AsO4)3(SO4)3(OH)27·33(H2O) R 3m 3 2/m

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Parnauite

Cu9(AsO4)2(SO4)(OH)10·7(H2O)
Dana No: 43.5.13.1 Strunz No: VII/D.20-30
Locality:

Notes: