Tetrarooseveltite Mineral Data

Tetrarooseveltite Mineral Data +

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General Tetrarooseveltite Information

Chemical Formula:

BiAsO4

Composition:

Molecular Weight = 347.90 gm

Bismuth 60.07 % Bi 66.97 % Bi₂O₃

Arsenic 21.54 % As 33.03 % As₂O₅

Oxygen 18.40 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Bi(AsO₄)

Environment:

Oxidation product found on fluorite-barite gange.

IMA Status:

Approved IMA 1994

Locality:

Josef mine, Moldava deposit, Krune Hory Mountains, norhtwestern Bohemia, Czech Republic. Link to MinDat.org Location Data.

Name Origin:

Named as the tetragonal analog of rooseveltite.

Synonym:

IMA1993-006

Tetrarooseveltite Image

Images:

Tetrarooseveltite

Comments: Light-yellow, earthy tetrarooseveltite.
Location: Moldava, Teplice (Teplitz), Krusn? Hory (Erzgebirge), Severocesk? Kraj, Bohemia, Czech Republic. Scale: Picture size 4.5 mm.
© Thomas Witzke / Abraxas-Verlag

Tetrarooseveltite Crystallography

Axial Ratios:

a:c = 1:2.29891

Cell Dimensions:

a = 5.085, c = 11.69, Z = 4; V = 302.27 Den(Calc)= 7.64

Crystal System:

Tetragonal - DipyramidalH-M Symbol (4/m) Space Group: I 4₁/a

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

By Intensity(I/I_o): 3.066(1), 1.933(0.55), 2.546(0.12),

Crystal Structure:

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Mooney R C L , Acta Crystallographica , 1 (1948) p.163-165, Crystal structure of tetragonal bismuth arsenate, BiAsO4, Locality: synthetic

Physical Properties of Tetrarooseveltite

Color:

Yellowish white, White.

Diaphaniety:

Translucent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Powdery - Forms a loose, poorly-coherent pulverulent mass.

Hardness:

2.5 - Finger Nail

Luminescence:

Non-fluorescent.

Luster:

Earthy (Dull)

Streak:

white

Optical Properties of Tetrarooseveltite

Gladstone-Dale:

CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1571,KC= 0.156

Optical Data:

Uniaxial (+), w=2.2, e=2.2, bire=0.0000.

Calculated Properties of Tetrarooseveltite

Electron Density:

r_electron=6.50 gm/cc
note: r_{Tetrarooseveltite}=7.64 gm/cc.

Fermion Index

Fermion Index = 0.00008
Boson Index = 0.99992

Photoelectric:

PE_{Tetrarooseveltite}=1,152.58 barns/electron
U=PE_{Tetrarooseveltite} x r_electron=7,492.05 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tetrarooseveltite is Not Radioactive

Tetrarooseveltite Classification

Dana Class:

38.4.5.1 (38)Anhydrous Phosphates, etc

(38.4)A+ XO4

(38.4.5)Dana Group

38.4.5.1 Tetrarooseveltite BiAsO4 I 4₁/a 4/m

Strunz Class:

VII/A.18-30 VII - Phosphates, Arsenates and Vanadates

VII/A - Waterfree phosphates [PO4]3- without unfamiliar anions, cations of very big size: Ca, Na and andre

VII/A.18 - Gasparite series

VII/A.18-10 Gasparite-(Ce) CeAsO4 P 2₁/n 2/m

VII/A.18-20 Rooseveltite BiAsO4 P 2/m 2/m

VII/A.18-30 Tetrarooseveltite BiAsO4 I 4₁/a 4/m

VII/A.18-40 Ximengite BiPO4 P 3₁21 3 2

Other Tetrarooseveltite Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.79,p1211,1994) OPTIC PROP.(Am.Min.,Vol.79,p1211,1994)

See Also:

Links to other databases for Tetrarooseveltite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 -École des Mines de Paris

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

Tetrarooseveltite

BiAsO4
Dana No: 38.4.5.1 Strunz No: VII/A.18-30
Locality:

Notes: