Orlandiite Mineral Data

Orlandiite Mineral Data

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General Orlandiite Information

Chemical Formula:

Pb3(Cl,OH)4(SeO3)·(H2O)

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

Empirical Formula:

Pb₃Cl_3.5(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

Orlandiite Image

Images:

Orlandiite

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

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 - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 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),

Crystal Structure:

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Demartin F , Gramaccioli C M , Pilati T , The Canadian Mineralogist , 41 (2003) p.1147-1153, The crystal structure of orlandiite, Pb3Cl4(SeO3).H2O, a complex case, of twinning and disorder

Physical Properties of Orlandiite

Cleavage:

[010] Perfect

Color:

Colorless, White.

Diaphaniety:

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

Optical Properties of Orlandiite

Gladstone-Dale:

CI calc= 0.054 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1658,KC= 0.1752

Optical Data:

Biaxial (?), b=1.96

Calculated Properties of Orlandiite

Electron Density:

r_electron=4.87 gm/cc
note: r_Orlandiite=5.79 gm/cc.

Fermion Index

Fermion Index = 0.15949
Boson Index = 0.84051

Photoelectric:

PE_Orlandiite=1,270.59 barns/electron
U=PE_Orlandiite x r_electron=6,185.40 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Orlandiite is Not Radioactive

Orlandiite Classification

Dana Class:

12.1.10.1 (12)Compound Halides

(12.1)with miscellaneous anions

(12.1.10)Dana Group

12.1.10.1 Orlandiite ! Pb3(Cl,OH)4(SeO3)·(H2O) P1 1

Strunz Class:

IV/J.01-30 IV - Oxides

IV/J - Arsenides with [AsO3]3- groups

IV/J.01 - Reinerite series

IV/J.01-10 Reinerite Zn3(AsO3)2 Pbam 2/m 2/m 2/m

IV/J.01-30 Orlandiite Pb3(Cl,OH)4(SeO3)·(H2O) P1 1

Other Orlandiite Information

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 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Orlandiite

Pb3(Cl,OH)4(SeO3)·(H2O)
Dana No: 12.1.10.1 Strunz No: IV/J.01-30
Locality:

Notes: