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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
[O
 
3
|(AsO
 
4
)
 
2
]
System:TriclinicColour:reddish brown, blackish ...
Lustre:AdamantineHardness:5½
Name:
For Argentine mineralogist Victorio Angelelli (1908-1991)
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
Year of Discovery:1959
Geological Setting of type material:Fumerole

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
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

Optical Data of Angelellite

Type:Biaxial (+)
RI values: nα = 2.130 nβ = 2.200 nγ = 2.400
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
[O
 
3
|(AsO
 
4
)
 
2
]
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
[(OH)
 
5
|(PO
 
4
)
 
3
]
8.BC.10Rockbridgeite
Fe
2+
 
Fe
3+
4
[(OH)
 
5
|(PO
 
4
)
 
3
]
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
Fe
3+
 
AsO
 
4
·2H
 
2
O
20.9.3Kaňkite
FeAsO
 
4
·3.5H
 
2
O
20.9.4Ferrisymplesite
Fe
3+
3
[(OH)
 
3
|(AsO
 
4
)
 
2
] · 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
[(OH)
 
4
|(AsO
 
4
)
 
3
] · 6-7H
 
2
O
20.9.9Pharmacosiderite
KFe
3+
4
[(OH)
 
4
|(AsO
 
4
)
 
3
] · 6-7H
 
2
O
20.9.10Kolfanite
Ca
 
2
Fe
3+
2
[O
 
2
|(AsO
 
4
)
 
3
] · 2H
 
2
O
20.9.11Arseniosiderite
Ca
 
2
Fe
3+
3
[O
 
2
|(AsO
 
4
)
 
3
] · 3H
 
2
O
20.9.12Yukonite
Ca
 
3
Fe
3+
 
[(OH)
 
3
|(AsO
 
4
)
 
2
] · 5H
 
2
O
20.9.13Dussertite
BaFe
3+
3
[(OH)
 
5
|(AsO
 
4
)
 
2
]
20.9.14Liskeardite
(Al,Fe
3+
 
)
 
3
[(OH)
 
6
|AsO
 
4
] · 5H
 
2
O
20.9.15Mapimite
Zn
 
2
Fe
3+
3
[(OH)
 
4
|(AsO
 
4
)
 
3
] · 10H
 
2
O
20.9.16Ogdensburgite
Ca
 
2
Fe
3+
4
(Zn,Mn
2+
 
)[(OH)
 
3
|(AsO
 
4
)
 
2
]
 
2
 · 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
Spanish:Angelellita

Other Information

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:American Mineralogist: 44: 1322.
Neus Jahrb Mineral Montasch (1959) 145-151;152-158

Neues Jahrbuch für Mineralogie, Abhandlungen: 132: 91-100.

Internet Links for Angelellite

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    Localities for Angelellite

    (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
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