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Orlandiite Mineral Data
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General Orlandiite Information
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 Chemical Formula: |
Pb3(Cl,OH)4(SeO3)•(H2O) |
| Composition: |
Molecular Weight = 899.16 gm |
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Hydrogen 0.28 % H 2.50 % H2O |
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Lead 69.13 % Pb 74.47 % PbO |
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Selenium 8.78 % Se 12.34 % SeO2 |
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Chlorine 13.80 % Cl 13.80 % Cl |
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- %
Cl -3.11 % -O=Cl2 |
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Oxygen 8.01 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Pb3Cl3.5(OH)0.5(SeO3)•(H2O) |
| Environment: |
Secondary mineral in the oxidation zone of an old lead and arsenic mine. |
| IMA Status: |
Approved IMA 1998 (Dana # Added) |
| Locality: |
Baccu Locci mine, Sardinia, Italy. Link to MinDat.org Location Data. |
| Name Origin: |
Named for mineralogist Paolo Orlandi (1946-) of the University of Pisa, Italy. |
| Synonym: |
IMA1998-038 |
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Orlandiite Image |
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Images:
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Orlandiite Crystallography
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| Axial Ratios: |
a:b:c =0.9665:1:1.0964 |
| Cell Dimensions: |
a = 8.146, b = 8.428, c = 9.241, Z = 2; alpha = 62.32°, beta = 71.64°, gamma = 75.22° V = 515.59 Den(Calc)= 5.79 |
| Crystal System: |
Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1 |
| X Ray Diffraction: |
By Intensity(I/Io): 4(1)(002), 3.258(0.75)(121), 3.188(0.75)(201),
3.818(0.55)(201), 3.731(0.44)(122), 2.103(0.4)(142), 2.728(0.38)(223), 2.365(0.37)(123), 8.09(0.36)(001), |
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Physical Properties of Orlandiite
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| Cleavage: |
{010} Perfect |
| Color: |
Colorless, White. |
| Diaphaneity: |
Translucent |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Habit: |
Tabular - Form dimensions are thin in one direction. |
| Luster: |
Vitreous - Silky |
| Streak: |
white |
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Optical Properties of Orlandiite
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| Gladstone-Dale: |
CI calc= 0.03 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1699,KC= 0.1752
Ncalc = 1.99 |
| Optical Data: |
Biaxial (?), b=1.96 |
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Calculated Properties of Orlandiite
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| Electron Density: |
Bulk Density (Electron Density)=4.75 gm/cc
note: Specific Gravity of Orlandiite =5.65 gm/cc.
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| Fermion Index: |
Fermion Index = 0.15
Boson Index = 0.85 |
| Photoelectric: |
PEOrlandiite =1,270.59 barns/electron
U=PEOrlandiite x rElectron Density=6,035.84 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Orlandiite is Not Radioactive |
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Orlandiite Classification
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| Dana Class: |
12.01.10.01 (12)Compound Halides |
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(12.01)with miscellaneous anions |
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(12.01.10)Dana Group |
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12.01.10.01 Orlandiite! Pb3(Cl,OH)4(SeO3)•(H2O) P1 1 |
| Strunz Class: |
04.JH.20 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.J - Arsenites, Antimonites, Bismuthites, Sulfites, |
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04.JH -Selenites without additional anions, with H2O |
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04.JH.20 Orlandiite! Pb3(Cl,OH)4(SeO3)•(H2O) P1 1 |
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Other Orlandiite Information
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| References: |
NAME( AmMin, Vol 85, p 1563) PHYS. PROP.(AmMin, Vol 85, p 1563) OPTIC PROP.(CanMin, Vol 38) |
| See Also: |
Links to other databases for Orlandiite :
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 Orlandiite Specimen Label here :
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Orlandiite
Pb3(Cl,OH)4(SeO3)•(H2O)
Dana No: 12.01.10.01 Strunz No: 04.JH.20
Locality:
Notes:
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