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Parnauite Mineral Data |
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Parnauite Mineral Data |
General Parnauite Information |
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 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  |
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Parnauite Image | |||
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Images:
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Parnauite Crystallography |
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| 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 | ||
| X Ray Diffraction: |
By Intensity(I/Io): 14.3(1), 4.52(0.6), 10.38(0.24), | ||
Physical Properties of Parnauite |
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| 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 |
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| 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 |
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| 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 |
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| Electron Density: |
Bulk Density (Electron Density)=2.98 gm/cc note: Specific Gravity of Parnauite =3.09 gm/cc. |
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| Fermion Index: |
Fermion Index = 0.0003758749 Boson Index = 0.9996241251 |
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| Photoelectric: |
PEParnauite = 28.42 barns/electron U=PEParnauite x rElectron Density= 84.70 barns/cc. |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Parnauite is Not Radioactive |
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Parnauite Classification |
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| Dana Class: |
43.05.13.01 (43)Compound Phosphates, etc. | ||
| (43.05)(Hydrated Compound Anions With Hydroxyl or Halogen) | |||
| (43.05.13)Dana Group | |||
| 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 | |||
Other Parnauite Information |
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| 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 Search for Parnauite using: Visit our Advertisers for Parnauite : Ask about Parnauite here : Print or Cut-and-Paste your Parnauite Specimen Label here :
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