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Angelellite

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Vela Yareta Mine (Yareta adit), Cerro Pululus, Laguna Vilama, Jujuy, Argentina
© 2008, JGW




Formula:
Fe
3+
4
(AsO
 
4
)
 
2
O
 
3
System:TriclinicColour:reddish brown, blackish ...
Lustre:AdamantineHardness:5½
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 Angelellite

IMA status:Approved
Strunz 8th edition ID:7/B.09-20
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:41.6.10.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
6 : A2(XO4)Zq
Hey's CIM Ref.:20.9.1

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

Type Locality:Vela Yareta Mine (Yareta adit), Cerro Pululus, Laguna Vilama, Jujuy, Argentina
General Appearance of Type Material:Dark brown incrustations with a high luster
Year of Discovery:1959
Geological Setting of type material:Fumarole associated with tin mineralization
Associated Minerals at type locality:
HematiteCassiterite

Physical Properties of Angelellite

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

Crystallography of Angelellite

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

Optical Data of Angelellite

Type:Biaxial (+)
RI values: nα = 2.130 nβ = 2.200 nγ = 2.400
Birefringence:0.27
Maximum Birefringence:δ = 0.270

Chart 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 Angelellite

Formula:
Fe
3+
4
(AsO
 
4
)
 
2
O
 
3
Essential elements:As, Fe, O
All elements listed in formula:As, Fe, O

Relationship of Angelellite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.BC.10Frondelite
Mn
2+
 
Fe
3+
4
(PO
 
4
)
 
3
(OH)
 
5
8.BC.10Rockbridgeite
Fe
2+
 
Fe
3+
4
(PO
 
4
)
 
3
(OH)
 
5
8.BC.10Plimerite
ZnFe
3+
4
(PO
 
4
)
 
3
(OH)
 
5
8.BC.15Aerugite
Ni
 
8.5
(AsO
 
4
)
 
2
As
5+
 
O
 
8
Related Minerals - Hey's Index Grouping:

- +
20.9.2Scorodite
FeAsO
 
4
 · 2H
 
2
O
20.9.3Kaňkite
FeAsO
 
4
 · 3.5H
 
2
O
20.9.4Ferrisymplesite
Fe
3+
3
(AsO
 
4
)
 
2
(OH)
 
3
 · 5H
 
2
O
20.9.5Kaatialaite
Fe(H
 
2
AsO
 
4
)
 
3
 · 5H
 
2
O
20.9.6Symplesite
Fe
2+
3
(AsO
 
4
)
 
2
 · 8H
 
2
O
20.9.7Parasymplesite
Fe
2+
3
(AsO
 
4
)
 
2
 · 8H
 
2
O
20.9.8Natropharmacosiderite
(Na,K)Fe
3+
4
(AsO
 
4
)
 
3
(OH)
 
4
 · 6-7H
 
2
O
20.9.9Pharmacosiderite
KFe
3+
4
(AsO
 
4
)
 
3
(OH)
 
4
 · 6-7H
 
2
O
20.9.10Kolfanite
Ca
 
2
Fe
3+
2
(AsO
 
4
)
 
3
O
 
2
 · 2H
 
2
O
20.9.11Arseniosiderite
Ca
 
2
Fe
3+
3
(AsO
 
4
)
 
3
O
 
2
 · 3H
 
2
O
20.9.12Yukonite
Ca
 
3
Fe
3+
 
(AsO
 
4
)
 
2
(OH)
 
3
 · 5H
 
2
O
20.9.13Dussertite
BaFe
3+
3
(AsO
 
4
)
 
2
(OH)
 
5
20.9.14Liskeardite
(Al,Fe
3+
 
)
 
3
(AsO
 
4
)(OH)
 
6
 · 5H
 
2
O
20.9.15Mapimite
Zn
 
2
Fe
3+
3
(AsO
 
4
)
 
3
(OH)
 
4
 · 10H
 
2
O
20.9.16Ogdensburgite
Ca
 
2
Fe
3+
4
(Zn,Mn
2+
 
)(AsO
 
4
)
 
4
(OH)
 
6
 · 6H
 
2
O
20.9.17Walentaite
H(Ca,Mn
2+
 
,Fe
2+
 
)Fe
3+
3
(AsO
 
4
,PO
 
4
)
 
4
 · 7H
 
2
O

Other Names for Angelellite

Other Languages:
German:Angelellit
Russian:Ангелеллит
Simplified Chinese:脆砷铁矿
Spanish:Angelellita

Other Information

Fluorescence in UV light:Not fluorescent
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Angelellite

Reference List:

- +
Ramdohr, P., F. Ahlfeld, and F. Berndt (1959) Angelellit, ein natuerliches
triklines Eisen-Arsenat, 2Fe203 0 As205. Neues Jahrb. Mineral., Monatsh., 145-151 (in German).

Weber, K. (1959) Eine kristallgraphische Untersuchung des Angelellits, 2Fe203 oAs205. Neues Jahrb. Mineral., Monatsh., 152-158 (in German).

(1959) Amer. Mineral., 44,1322-1323 (abs. refs. 1 and 2).

Moore, P. B. and T. Araki (1978) Angelellite, Fe~+03(As5+04h a novel cubic close-packed oxide structure. Neues Jahrb. Mineral., Abh., 132, 91-100 (in German with English abs.).

Internet Links for Angelellite

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    • Localities for Angelellite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Argentina
     
    • Jujuy
      • 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 (Mozhugongka) Co.
    		Suiliang Dong, Hanxiao Huang, Bo Liu, Li Zhang, and Hui Zhang (2010): Geology and Exploration 46(2), 207-213
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