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Angelellite

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About AngelelliteHide

Victorio Angelelli
Formula:
Fe3+4(AsO4)2O3
Colour:
reddish brown, blackish brown, dark brown
Lustre:
Adamantine
Hardness:
Specific Gravity:
4.867
Crystal System:
Triclinic
Name:
Named by Paul Ramdor, Friedrich Ahlfeld, and Fritz Berndt in 1959 honor of Argentine mineralogist Victorio Angelelli (February 20, 1908 Fabriano, Italy - August 5, 1991 Buenos Aires, Argentina, professor of Economic Geology at Universidad Nacional de La Plata and, later, director of the Argentinian Institute of Mineral Resources.
This page provides mineralogical data about Angelellite.


Classification of AngelelliteHide

Approved
8.BC.05

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
C : With only medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
41.6.10.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
6 : A2(XO4)Zq
20.9.1

20 : Arsenates (also arsenates with phosphate, but without other anions)
9 : Arsenates of Fe

Physical Properties of AngelelliteHide

Adamantine
Transparency:
Translucent
Colour:
reddish brown, blackish brown, dark brown
Streak:
reddish brown
Hardness:
5½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
{001}
Fracture:
Conchoidal
Density:
4.867 g/cm3 (Measured)    4.862 g/cm3 (Calculated)

Optical Data of AngelelliteHide

Type:
Biaxial (+)
RI values:
nα = 2.130 nβ = 2.200 nγ = 2.400
Birefringence:
0.27
Max Birefringence:
δ = 0.270
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r < v
Pleochroism:
Strong
Comments:
Deep blood red to reddish brown

Chemical Properties of AngelelliteHide

Formula:
Fe3+4(AsO4)2O3
IMA Formula:
Fe3+4O3(AsO4)2

Crystallography of AngelelliteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 5.036(3) Å, b = 6.461 Å, c = 6.594 Å
α = 114.4°, β = 116.4°, γ = 81.9°
Ratio:
a:b:c = 0.779 : 1 : 1.021
Unit Cell V:
174.77 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Tabular crystals to 1cm

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.29 (30)
3.152 (100)
2.997 (70)
2.960 (40)
2.955 (40)
2.856 (50)
2.489 (50)
2.072 (50)
Comments:
ICDD 13-121

Type Occurrence of AngelelliteHide

General Appearance of Type Material:
Dark brown incrustations with a high luster
Geological Setting of Type Material:
Fumarole associated with tin mineralization
Associated Minerals at Type Locality:

Other Language Names for AngelelliteHide

German:Angelellit
Simplified Chinese:脆砷铁矿
Spanish:Angelellita

Related Minerals - Nickel-Strunz GroupingHide

8.BC.10FrondeliteMn2+Fe3+4(PO4)3(OH)5Orth. 2 2 2 : C2 2 21
8.BC.10RockbridgeiteFe2+Fe3+4(PO4)3(OH)5Orth. mmm (2/m 2/m 2/m)
8.BC.10PlimeriteZnFe3+4(PO4)3(OH)5Orth. mmm (2/m 2/m 2/m)
8.BC.15AerugiteNi8.5(AsO4)2As5+O8Mon. 2/m : B2/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

20.9.2ScoroditeFe3+AsO4 · 2H2OOrth. mmm (2/m 2/m 2/m)
20.9.3KaňkiteFeAsO4 · 3.5H2OMon.
20.9.4FerrisymplesiteFe3+3(AsO4)2(OH)3 · 5H2O
20.9.5KaatialaiteFe(H2AsO4)3 · 5H2OMon. 2/m
20.9.6SymplesiteFe2+3(AsO4)2 · 8H2OTric. 1 : P1
20.9.7ParasymplesiteFe2+3(AsO4)2 · 8H2OMon. 2/m : B2/m
20.9.8Natropharmacosiderite(Na,K)Fe3+4(AsO4)3(OH)4 · 6-7H2OIso. 4 3m : P4 3m
20.9.9PharmacosideriteKFe3+4(AsO4)3(OH)4 · 6-7H2OIso. 4 3m : P4 3m
20.9.10KolfaniteCa2Fe3+3O2(AsO4)3 · 2H2OMon.
20.9.11ArseniosideriteCa2Fe3+3(AsO4)3O2 · 3H2OMon. 2/m : B2/b
20.9.12YukoniteCa3Fe3+(AsO4)2(OH)3 · 5H2OOrth. mm2
20.9.13DussertiteBaFe3+3(AsO4)(AsO3OH)(OH)6Trig. 3m (3 2/m) : R3m
20.9.14Liskeardite[(Al,Fe)32(AsO4)18(OH)42(H2O)22] · 52H2OOrth.
20.9.15MapimiteZn2Fe3+3(AsO4)3(OH)4 · 10H2OMon.
20.9.16OgdensburgiteCa2Fe3+4(Zn,Mn2+)(AsO4)4(OH)6 · 6H2OOrth. mmm (2/m 2/m 2/m) : Cmmm
20.9.17WalentaiteH(Ca,Mn2+,Fe2+)Fe3+3(AsO4,PO4)4 · 7H2OOrth.

Fluorescence of AngelelliteHide

Not fluorescent

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for AngelelliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Fleischer, M. (1959) New mineral names. American Mineralogist: 44: 1321-1329.
Ramdohr, P., Ahlfeld, F., Berndt, F. (1959) Angelellit, ein natürliches triklines Eisen-Arsenat, 2Fe203·As205. Neues Jahrbuch für Mineralogie, Monatshefte: 1959: 145-151. [in German]
Weber, K. (1959) Eine kristallgraphische Untersuchung des Angelellits, 2Fe203 oAs205. Neues Jahrbuch für Mineralogie, Monatshefte: 1959: 152-158. [in German]
Moore, P.B., Araki, T. (1978) Angelellite, Fe~+03(As5+04h a novel cubic close-packed oxide structure. Neues Jahrbuch für Mineralogie, Abhandlungen: 132: 91-100. [in German with English abstract]
Wright, J.P., McLaughlin, A.C., Attfield, J.P. (2000): Partial frustration of magnetic order in synthetic angelellite, Fe4As2O11. Journal of the Chemical Society, Dalton Transactions, 2000, 3663-3668.

Internet Links for AngelelliteHide

Localities for AngelelliteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Argentina (TL)
 
  • Jujuy
    • Rinconada Department
      • Laguna Vilama
        • Cerro Pululus
Neues Jahrb.Mineral., Mh. (1959) 145-151 (and 152-158); Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 4, 2000
China
 
  • Tibet Autonomous Region
    • Lhasa Prefecture
      • Maizhokunggar Co. (Mozhugongka Co.)
Suiliang Dong, Hanxiao Huang, Bo Liu, Li Zhang, and Hui Zhang (2010): Geology and Exploration 46(2), 207-213; Yunfei Liu, Zhiming Yang, Yuling Xie, Ping Zhou, Denghu Du, Yingxu Li, Qiuyun Li, Huanchun Qu, and Bo Xu (2012): Mineral Deposits 31(4), 727-744
Mineral and/or Locality  
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