Angelellite Mineral Data

General Angelellite Information

Chemical Formula:

Fe+++4(AsO4)2O3

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

Empirical Formula:

Fe³⁺₄(AsO₄)₂O₃

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

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

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

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

By Intensity(I/I_o): 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:

PE_Angelellite= 31.39 barns/electron
U=PE_Angelellite x rElectron 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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