Angelellite Mineral Data
General Angelellite Information
Chemical Formula:
Fe+++4(AsO4)2O3
Composition:
Molecular Weight = 549.22 gm
Iron 40.67 % Fe 58.15 % Fe2 O3
Arsenic 27.28 % As 41.85 % As2 O5
Oxygen 32.04 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Fe3+ 4 (AsO4 )2 O3
Environment:
Probably of exhalative origin, in tin ore.
IMA Status:
Approved IMA 1959
Locality:
From the Vela Yareta tin mine, on Cerro Pululus, east of Laguna Vilama, Jujuy Province, Argentina. Link to MinDat.org Location Data.
Name Origin:
To honor Dr. Victorio Angelelli (1908- ), Argentinean mining geologist, Director of the Argentinean Geological Survey.
Name Pronunciation:
Angelellite + Pronunciation
Synonym:
ICSD 100442
PDF 13-121
Angelellite Image
Images:
Angelellite Crystallography
Axial Ratios:
a:b:c =0.775:1:1.0955
Cell Dimensions:
a = 5.03, b = 6.49, c = 7.11, Z = 1; alpha = 114°, beta = 116°, gamma = 81° V = 188.23 Den(Calc)= 4.84
Crystal System:
Triclinic - Pinacoidal H-M Symbol ( 1 ) Space Group: P1
X Ray Diffraction:
By Intensity(I/Io ): 3.152(1), 2.997(0.7), 2.856(0.5),
Physical Properties of Angelellite
Cleavage:
{???} Indistinct
Color:
Black brown.
Density:
4.867
Fracture:
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Hardness:
5.5 - Knife Blade
Luster:
Adamantine - Metallic
Streak:
reddish brown
Optical Properties of Angelellite
Gladstone-Dale:
CI meas = -0.018 (Superior) - where the CI = (1-KPDmeas /KC ) CI calc = -0.034 (Excellent) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.2596,KPDmeas = 0.2555,KC = 0.251 Ncalc = 2.2 - 2.22
Optical Data:
Biaxial (+), a=2.13, b=2.2, g=2.4, bire=0.2700
Calculated Properties of Angelellite
Electron Density:
Bulk Density (Electron Density)=4.57 gm/cc note: Specific Gravity of Angelellite =4.87 gm/cc.
Fermion Index:
Fermion Index = 0.0087765596 Boson Index = 0.9912234404
Photoelectric:
PEAngelellite = 31.39 barns/electronU=PEAngelellite x r Electron Density= 143.54 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Angelellite is Not Radioactive
Angelellite Classification
Dana Class:
41.06.10.01 (41) Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
(41.06) where (A)2 (XO4) Zq
(41.06.10) Dana Group
41.06.10.01 Angelellite Fe4(AsO4)2O3 P1 1
Strunz Class:
08.BC.05 08 - PHOSPHATES, ARSENATES, VANADATES
08.B - Phosphates, etc. with Additional Anions, without H2O
08.BC -With only medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
08.BC.05 Angelellite Fe4(AsO4)2O3 P1 1
Other Angelellite Information
References:
NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also:
Links to other databases for Angelellite :
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 Angelellite Specimen Label here :
Angelellite
Fe+++4(AsO4)2O3
Dana No: 41.06.10.01 Strunz No: 08.BC.05
Locality:
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