Rooseveltite Mineral Data

General Rooseveltite 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:

Cassiterite veinlets in rhyolite-dacite lava flows

IMA Status:

Valid Species (Pre-IMA) 1946

Locality:

Santiaguillo, west of Maragua, Potosi, Bolivia. Link to MinDat.org Location Data.

Name Origin:

Named for Franklin Delano Roosevelt (1882-1945), 32nd President of the USA.

Name Pronunciation:

Rooseveltite + Pronunciation

Synonym:

ICSD 27199

PDF 25-89

Rooseveltite Image

Images:

Rooseveltite

Comments: Gray glassy crystalline rooseveltite with purple fluorite.
Location: Josef Fluorite Mine, Krune Hora Mountains, near Teplice, Seversocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Rooseveltite Crystallography

Axial Ratios:

a:b:c =0.9606:1:0.9399

Cell Dimensions:

a = 6.882, b = 7.164, c = 6.734, Z = 4; beta = 104.83° V = 320.94 Den(Calc)= 7.20

Crystal System:

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

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

By Intensity(I/I_o): 3.15(1), 2.96(0.7), 4.82(0.4),

Physical Properties of Rooseveltite

Color:

Gray, Gray white.

Density:

6.86

Diaphaneity:

Translucent

Fracture:

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

Hardness:

4-4.5 - Between Fluorite and Apatite

Luster:

Adamantine

Streak:

white

Optical Properties of Rooseveltite

Gladstone-Dale:

CI meas= -0.081 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.03 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1606,KPDmeas= 0.1686,KC= 0.156
Ncalc = 2.07 - 2.12

Optical Data:

Biaxial (+), a=2.14, b=2.15, g=2.18, bire=0.0400, 2V(Calc)=62, 2V(Meas)=50.

Calculated Properties of Rooseveltite

Electron Density:

Bulk Density (Electron Density)=6.13 gm/cc
note: Specific Gravity of Rooseveltite =7.20 gm/cc.

Fermion Index:

Fermion Index = 0.0000888987
Boson Index = 0.9999111013

Photoelectric:

PE_Rooseveltite=1,152.58 barns/electron
U=PE_Rooseveltite x rElectron Density=7,060.57 barns/cc.

Radioactivity:

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

Rooseveltite Classification

Dana Class:

38.04.04.01 (38)Anhydrous Phosphates, etc

(38.04)A+ XO4

(38.04.04)Dana Group

38.04.04.01 Rooseveltite BiAsO4 P 2/m 2/m

Strunz Class:

08.AD.50 08 - PHOSPHATES, ARSENATES, VANADATES

08.A - Phosphates, etc. without additional anions, without H2O

08.AD -With only large cations

08.AD.50 Brabantite? CaTh(PO4)2 P 2₁ 2

08.AD.50 Gasparite-(Ce) CeAsO4 P 2₁/n 2/m

08.AD.50 Monazite-(Ce) (Ce,La,Nd,Th)PO4 P 2₁/n 2/m

08.AD.50 Monazite-(La) (La,Ce,Nd)PO4 P 2₁/n 2/m

08.AD.50 Monazite-(Nd) (Nd,Ce,La)(P,Si)O4 P 2₁/n 2/m

08.AD.50 Rooseveltite BiAsO4 P 2/m 2/m

08.AD.50 Monazite-(Sm)! SmPO4 P 2₁/n 2/m

Other Rooseveltite Information

References:

NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Rooseveltite :
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 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST

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

Rooseveltite

BiAsO4
Dana No: 38.04.04.01 Strunz No: 08.AD.50
Locality:

Notes:

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