Rooseveltite Mineral Data
General Rooseveltite Information
Chemical Formula:
BiAsO4
Composition:
Molecular Weight = 347.90 gm
Bismuth 60.07 % Bi 66.97 % Bi2 O3
Arsenic 21.54 % As 33.03 % As2 O5
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 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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PERooseveltite =1,152.58 barns/electronU=PERooseveltite x r Electron 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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