Angelellite Mineral Data

Angelellite Mineral Data
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General Angelellite Information

Help on Chemical Formula: Chemical Formula: Fe+++4(AsO4)2O3
Help on Composition: Composition: Molecular Weight = 549.22 gm
   Iron     40.67 %  Fe   58.15 % Fe2O3
   Arsenic  27.28 %  As   41.85 % As2O5
   Oxygen   32.04 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe3+4(AsO4)2O3
Help on Environment: Environment: Probably of exhalative origin, in tin ore.
Help on IMA Status: IMA Status: Approved IMA 1959
Help on Locality: Locality: From the Vela Yareta tin mine, on Cerro Pululus, east of Laguna Vilama, Jujuy Province, Argentina. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: To honor Dr. Victorio Angelelli (1908- ), Argentinean mining geologist, Director of the Argentinean Geological Survey.
Help on Name Pronunciation: Name Pronunciation: Angelellite + Pronunciation Say ANGELELLITE
Help on Synonym: Synonym: ICSD 100442
  PDF 13-121
 

Angelellite Image

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Angelellite

Comments: Back microcrystalline angelellite on matrix.
Location: Cerro Pululus Tin Mine, Jujuy, Argentina. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Angelellite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.775:1:1.0955
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.152(1), 2.997(0.7), 2.856(0.5),
Click Here for Large Angelellite Structure Window Crystal Structure:

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Moore P B , Araki T , Neues Jahrbuch fur Mineralogie, Abhandlungen , 132 (1978) p.91-100, Angelellite, Fe4O3(AsO4)2: a novel cubic close-packed oxide structure

 

Physical Properties of Angelellite

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Black brown.
Help on Density: Density: 4.867
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Adamantine - Metallic
Help on Streak: Streak: reddish brown
 

Optical Properties of Angelellite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (+), a=2.13, b=2.2, g=2.4, bire=0.2700
 

Calculated Properties of Angelellite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.57 gm/cc
note: Specific Gravity of Angelellite =4.87 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0087765596
Boson Index = 0.9912234404
Help on Photoelectric: Photoelectric: PEAngelellite = 31.39 barns/electron
U=PEAngelellite x rElectron Density= 143.54 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Angelellite is Not Radioactive
 

Angelellite Classification
Help on Dana Class: 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
Help on Strunz Class: 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
Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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:

 

Notes: