Angelellite Mineral Data

Angelellite Mineral Data +

[Express Minerals] [Minerals for Sale] [About Us] [En EspaÃƒï¿½Ã‚Â±ol] [Mineral Gallery]
Fabre Minerals - Europe's first Internet mineral dealer, on the web since 1996

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.

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 - PinacoidalH-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),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

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= -0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2569,KPDmeas= 0.2555,KC= 0.251

Optical Data:

Biaxial (+), a=2.13, b=2.2, g=2.4, bire=0.2700

Calculated Properties of Angelellite

Electron Density:

r_electron=4.57 gm/cc
note: r_Angelellite=4.87 gm/cc.

Fermion Index

Fermion Index = 0.00877
Boson Index = 0.99123

Photoelectric:

PE_Angelellite= 31.39 barns/electron
U=PE_Angelellite x r_electron= 143.54 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Angelellite is Not Radioactive

Angelellite Classification

Dana Class:

41.6.10.1 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.6)where (A)2 (XO4) Zq

(41.6.10)Dana Group

41.6.10.1 Angelellite Fe4(AsO4)2O3 P1 1

Strunz Class:

VII/B.09-20 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.09 - Aerugite - Aangelellite series

VII/B.09-10 Aerugite ([],Ni)9(AsO4)2(AsO6)(?) R 3m 3 2/m

VII/B.09-15 Grattarolaite! Fe3O3(PO4) R 3m 3m

VII/B.09-20 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 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST 12 -École des Mines de Paris

Search for Angelellite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Angelellite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Angelellite Mineral Data :

Ask about Angelellite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Angelellite

Fe+++4(AsO4)2O3
Dana No: 41.6.10.1 Strunz No: VII/B.09-20
Locality:

Notes: