Mineralogy Database

Descloizite Mineral Data

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General Descloizite Information

Help on Chemical  Formula: Chemical Formula: PbZn(VO4)(OH)
Help on Composition: Composition: Molecular Weight = 404.54 gm
   Vanadium  12.59 %  V    22.48 % V2O5
   Zinc      16.16 %  Zn   20.12 % ZnO
   Hydrogen   0.25 %  H     2.23 % H2O
   Lead      51.22 %  Pb   55.17 % PbO
   Oxygen    19.77 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: PbZn(VO4)(OH)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1854
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the French mineralogist, Alfred Des Closzeaux (1817-1897).
Help on Name Pronunciation: Name Pronunciation: Descloizite + Pronunciation Say DESCLOIZITE
 

Descloizite Image

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  Descloizite

Comments: Dark reddish brown, crystalline aggregate of descloizite.
Location: Grootfontein. Namibia. Scale: 3 cm.
© Fabre Minerals

Descloizite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8053:1:0.643
Help on Cell Dimensions: Cell Dimensions: a = 7.607, b = 9.446, c = 6.074, Z = 4; V = 436.45 Den(Calc)= 6.16
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnam
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.23(1), 2.9(0.8), 5.12(0.8),
Help on Forms: Forms:

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Help on Above

Forms: ( 2 1 0) ( 1 0 2) ( 0 1 1) ( 0 3 1) ( 1 1 1) ( 1 0 0) ( 0 0 1)

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Physical Properties of Descloizite

Help on Cleavage: Cleavage: None
Help on Color: Color: Dark brownish black, Dark reddish brown, Orange red, Reddish brown, Black.
Help on Density: Density: 6.1 - 6.2, Average = 6.15
Help on Diaphaneity: Diaphaneity: Transparent to Opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Plumose - "Mica-like" minerals forming aggregates of plume-like forms.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Greasy (Oily)
Help on Streak: Streak: light brownish green
 

Optical Properties of Descloizite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.089 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.087 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2056,KPDmeas= 0.206,KC= 0.1892
Ncalc = 2.15 - 2.17
Help on Optical Data: Optical Data: Biaxial (-), a=2.185, b=2.265, g=2.35, bire=0.1650, 2V(Calc)=88, 2V(Meas)=85-90. Dispersion relatively strong.
 

Calculated Properties of Descloizite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.36 gm/cc
note: Specific Gravity of Descloizite =6.16 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.12
Boson Index = 0.88
Help on Photoelectric: Photoelectric: PEDescloizite = 915.15 barns/electron
U=PEDescloizite x rElectron Density=4,905.24 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Descloizite is Not Radioactive
 

Descloizite Classification

Help on  Dana Class: Dana Class: 41.05.02.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.05)where (A B)2 (XO4) Zq
  (41.05.02)Descloizite Group
 
41.05.02.01 Descloizite PbZn(VO4)(OH) Pnam 2/m 2/m 2/m
 
41.05.02.02 Mottramite PbCu(VO4)(OH) Pnam 2/m 2/m 2/m
 
41.05.02.03 Pyrobelonite PbMn(VO4)(OH) Pnam 2/m 2/m 2/m
 
41.05.02.04 Cechite Pb(Fe,Mn)(VO4)(OH) Pnam 2/m 2/m 2/m
 
41.05.02.05 Duftite-alpha PbCu(AsO4)(OH) P 212121 2 2 2
Help on  Strunz Class: Strunz Class: 08.BH.40 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BH -With medium-sized and large cations, (OH,etc.):RO4 = 1:1
 
08.BH.40 Descloizite PbZn(VO4)(OH) Pnam 2/m 2/m 2/m
 
08.BH.40 Cechite Pb(Fe,Mn)(VO4)(OH) Pnam 2/m 2/m 2/m
 
08.BH.40 Duhamelite? Pb2Cu4Bi(VO4)4(OH)3•8(H2O) Unk Ortho
 
08.BH.40 Pyrobelonite PbMn(VO4)(OH) Pnam 2/m 2/m 2/m
 
08.BH.40 Mottramite PbCu(VO4)(OH) Pnam 2/m 2/m 2/m
 

Other Descloizite Information

Help on References: References: NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Sinkankas66)
Help on See Also: See Also: Links to other databases for Descloizite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Franklin Minerals(Dunn)
7 - Franklin Minerals(Palache)
8 - GeoScienceWorld
9 - Glendale Community College
10 - Google Images
11 - Google Scholar
12 - Handbook of Mineralogy (MinSocAm)
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - WWW-MINCRYST

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Print or Cut-and-Paste your Descloizite Specimen Label here :

Descloizite

PbZn(VO4)(OH)
Dana No: 41.05.02.01 Strunz No: 08.BH.40
Locality:

 

Notes:

 

 
   
 


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