Descloizite Mineral Data

General Descloizite Information

Chemical Formula:

PbZn(VO4)(OH)

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

Empirical Formula:

PbZn(VO₄)(OH)

IMA Status:

Valid Species (Pre-IMA) 1854

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named after the French mineralogist, Alfred Des Closzeaux (1817-1897).

Name Pronunciation:

Descloizite + Pronunciation

Descloizite Image

Images:

Descloizite

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

Descloizite Crystallography

Axial Ratios:

a:b:c =0.8053:1:0.643

Cell Dimensions:

a = 7.607, b = 9.446, c = 6.074, Z = 4; V = 436.45 Den(Calc)= 6.16

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnam

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

By Intensity(I/I_o): 3.23(1), 2.9(0.8), 5.12(0.8),

Forms:

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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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Crystal Structure:

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Qurashi M M , Barnes W H , The Canadian Mineralogist , 8 (1964) p.23-39, The structures of the minerals of the descloizite and adelite groups:, V - descloizite and conichalcite (part 3). The structure of descloizite

Physical Properties of Descloizite

Cleavage:

None

Color:

Dark brownish black, Dark reddish brown, Orange red, Reddish brown, Black.

Density:

6.1 - 6.2, Average = 6.15

Diaphaneity:

Transparent to Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Plumose - "Mica-like" minerals forming aggregates of plume-like forms.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3.5 - Copper Penny

Luminescence:

Non-fluorescent.

Luster:

Greasy (Oily)

Streak:

light brownish green

Optical Properties of Descloizite

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

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

Electron Density:

Bulk Density (Electron Density)=5.36 gm/cc
note: Specific Gravity of Descloizite =6.16 gm/cc.

Fermion Index:

Fermion Index = 0.12
Boson Index = 0.88

Photoelectric:

PE_Descloizite= 915.15 barns/electron
U=PE_Descloizite x rElectron Density=4,905.24 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Descloizite is Not Radioactive

Descloizite Classification

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

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

References:

NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Sinkankas66)

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: