Cassedanneite Mineral Data

General Cassedanneite Information

Chemical Formula:

Pb5(VO4)2(CrO4)2•(H2O)

Composition:

Molecular Weight = 1,515.88 gm

Vanadium 6.72 % V 12.00 % V₂O₅

Chromium 6.86 % Cr 13.19 % CrO₃

Hydrogen 0.13 % H 1.19 % H₂O

Lead 68.34 % Pb 73.62 % PbO

Oxygen 17.94 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₅(VO₄)₂(CrO₄)₂•(H₂O)

Environment:

Associated with embreyite.

IMA Status:

Approved IMA 1988

Locality:

Beresov, Ural Mountains, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Jacques P. Cassedanne (1928-), Brazilian mineralogist.

Cassedanneite Image

Images:

Cassedanneite

Comments: Crystalline mass of cassedanneite, colored green by included descloizite.
Location: Berezovskoye Mine, near Yekaterinburg, Sverdlovsk District, Middle Urals, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Cassedanneite Crystallography

Axial Ratios:

a:b:c =1.3348:1:1.6996

Cell Dimensions:

a = 7.693, b = 5.763, c = 9.795, Z = 1; beta = 115.93° V = 390.54 Den(Calc)= 6.44

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/m

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

By Intensity(I/I_o): 3.15(1), 3.22(0.6), 4.83(0.6),

Physical Properties of Cassedanneite

Color:

Red orange.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

3.5 - Copper Penny

Luster:

Resinous - Greasy

Streak:

yellow orange

Optical Properties of Cassedanneite

Optical Data:

NCalc= 2.2 - from Gladstone-Dale relationship (KC = 0.1869) where Ncalc=Dcalc*KC+1

Calculated Properties of Cassedanneite

Electron Density:

Bulk Density (Electron Density)=5.45 gm/cc
note: Specific Gravity of Cassedanneite =6.44 gm/cc.

Fermion Index:

Fermion Index = 0.15
Boson Index = 0.85

Photoelectric:

PE_{Cassedanneite}=1,241.83 barns/electron
U=PE_{Cassedanneite} x rElectron Density=6,774.04 barns/cc.

Radioactivity:

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

Cassedanneite Classification

Dana Class:

43.03.02.02 (43)Compound Phosphates, etc.

(43.03)(Hydrated Normal Compound Anions)

(43.03.02)Dana Group

43.03.02.01 Embreyite Pb5(CrO4)2(PO4)2•(H2O) P 2₁/m 2/m

43.03.02.02 Cassedanneite Pb5(VO4)2(CrO4)2•(H2O) A2/m 2/m

Strunz Class:

07.FC.20 07 - SULFATES (SELENATES, TELLURATES)

07.F - Chromates

07.FC -With PO4, AsO4, SiO4

07.FC.20 Cassedanneite Pb5(VO4)2(CrO4)2•(H2O) A2/m 2/m

07.FC.20 Embreyite Pb5(CrO4)2(PO4)2•(H2O) P 2₁/m 2/m

Other Cassedanneite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8)

See Also:

Links to other databases for Cassedanneite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Cassedanneite

Pb5(VO4)2(CrO4)2•(H2O)
Dana No: 43.03.02.02 Strunz No: 07.FC.20
Locality:

Notes:

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