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Orlandiite Mineral Data

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General Orlandiite Information

Help on Chemical  Formula: Chemical Formula: Pb3(Cl,OH)4(SeO3)•(H2O)
Help on Composition: Composition: Molecular Weight = 899.16 gm
   Hydrogen   0.28 %  H     2.50 % H2O
   Lead      69.13 %  Pb   74.47 % PbO
   Selenium   8.78 %  Se   12.34 % SeO2
   Chlorine  13.80 %  Cl   13.80 % Cl
               -   %   Cl   -3.11 % -O=Cl2   
   Oxygen     8.01 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb3Cl3.5(OH)0.5(SeO3)•(H2O)
Help on Environment: Environment: Secondary mineral in the oxidation zone of an old lead and arsenic mine.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Baccu Locci mine, Sardinia, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for mineralogist Paolo Orlandi (1946-) of the University of Pisa, Italy.
Help on Synonym: Synonym: IMA1998-038

Orlandiite Image

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Comments: White, acicular crystals of orlandiite.
Location: Baccu Locci Mine, Villaputzu, Cagliari Province, Sardinia, Italy. Scale: Picture size 2 mm.
© Thomas Witzke / Abraxas-Verlag

Orlandiite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9665:1:1.0964
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: 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),

Physical Properties of Orlandiite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: Colorless, White.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Luster: Luster: Vitreous - Silky
Help on Streak: Streak: white

Optical Properties of Orlandiite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.03 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1699,KC= 0.1752
Ncalc = 1.99
Help on Optical Data: Optical Data: Biaxial (?), b=1.96

Calculated Properties of Orlandiite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.75 gm/cc
note: Specific Gravity of Orlandiite =5.65 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.15
Boson Index = 0.85
Help on Photoelectric: Photoelectric: PEOrlandiite =1,270.59 barns/electron
U=PEOrlandiite x rElectron Density=6,035.84 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Orlandiite is Not Radioactive

Orlandiite Classification

Help on  Dana Class: Dana Class: (12)Compound Halides
  (12.01)with miscellaneous anions
  (12.01.10)Dana Group Orlandiite! Pb3(Cl,OH)4(SeO3)•(H2O) P1 1
Help on  Strunz Class: Strunz Class: 04.JH.20 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
  04.JH -Selenites without additional anions, with H2O
04.JH.20 Orlandiite! Pb3(Cl,OH)4(SeO3)•(H2O) P1 1

Other Orlandiite Information

Help on References: References: NAME( AmMin, Vol 85, p 1563) PHYS. PROP.(AmMin, Vol 85, p 1563) OPTIC PROP.(CanMin, Vol 38)
Help on See Also: 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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Dana No: Strunz No: 04.JH.20





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