Pseudoboleite Mineral Data

General Pseudoboleite Information

Chemical Formula: Pb5Cu4Cl10(OH)8•2(H2O) Composition: Molecular Weight = 10962.72 gm    Copper    13.91 %  Cu   17.41 % CuO    Hydrogen   0.44 %  H     3.94 % H₂O    Lead      58.59 %  Pb   63.12 % PbO    Chlorine  20.05 %  Cl   20.05 % Cl                -   %   Cl   -4.52 % -O=Cl₂       Oxygen     7.01 %  O             ______        ______              100.00 %      100.00 % = TOTAL OXIDE Empirical Formula: Pb₃₁Cu₂₄Cl₆₂(OH)₄₈ Environment: Sedimentary copper deposits. IMA Status: Valid Species (Pre-IMA) 1895 Locality: Boleo, near Santa Rosalia, Baja California Sur, Mexico. Link to MinDat.org Location Data. Name Origin: Named after its similarity to the mineral Boleite. Name Pronunciation: Pseudoboleite + Pronunciation Synonym: ICSD 67680   PDF 22-470   Percylite  

Pseudoboleite Image

Images:

Pseudoboleite Comments: Blue crystal of pseudoboleite. Location: Curuglu Mine, Santa Rosalía (El Boleó), Boleó District, Mun. de Mulegé, Baja California Sur, Mexico. Scale: Crystal size 4.5 mm. © Thomas Witzke / Abraxas-Verlag

Pseudoboleite Crystallography

Axial Ratios: a:c = 1:2.01706 Cell Dimensions: a = 15.24, c = 30.74, Z = 2; V = 7,139.60 Den(Calc)= 5.10 Crystal System: Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4/mmm X Ray Diffraction: By Intensity(I/I_o): 3.83(1), 4.43(1), 2.71(0.95), Crystal Structure:

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Giuseppetti G , Mazzi F , Tadini C , Neues Jahrbuch fur Mineralogie, Monatshefte , 1992 (1992) p.113-126

 

Physical Properties of Pseudoboleite

Cleavage: {001} Perfect Color: Indigo blue. Density: 5 Diaphaneity: Transparent Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. Habit: Pseudo Cubic - Crystals show a cubic outline. Hardness: 2.5 - Finger Nail Luster: Vitreous - Pearly Streak: light green  

Optical Properties of Pseudoboleite

Gladstone-Dale: CI meas= -0.067 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.199,KPDmeas= 0.203,KC= 0.1903
Ncalc = 1.95 - 1.97 Optical Data: Uniaxial (-), e=2, w=2.03, bire=0.0300.  

Calculated Properties of Pseudoboleite

Electron Density: Bulk Density (Electron Density)=4.40 gm/cc
note: Specific Gravity of Pseudoboleite =5.10 gm/cc.
Fermion Index: Fermion Index = 0.12
Boson Index = 0.88 Photoelectric: PE_{Pseudoboleite} =1,051.91 barns/electron
U=PE_{Pseudoboleite} x rElectron Density=4,623.51 barns/cc.
Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pseudoboleite is Not Radioactive  

Pseudoboleite Classification

Dana Class: 10.06.08.01 (10)Oxyhalides and Hydroxyhalides   (10.06)where Am Bn (O,OH)p Xq   (10.06.08)Dana Group  

10.06.08.01 Pseudoboleite Pb5Cu4Cl10(OH)8•2(H2O) I 4/mmm 4/m 2/m 2/m

Strunz Class: 03.DB.10 03 - HALIDES   03.D - Oxyhalides, Hydroxyhalides and Related Double Halides   03.DB -With Pb, Cu, etc.  

03.DB.10 Pseudoboleite Pb5Cu4Cl10(OH)8•2(H2O) I 4/mmm 4/m 2/m 2/m

 

Other Pseudoboleite Information

References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) See Also: Links to other databases for Pseudoboleite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
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Ask about Pseudoboleite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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