Angelellite
A valid IMA mineral species
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About Angelellite
Victorio Angelelli
Formula:
Fe3+4(AsO4)2O3
Colour:
Reddish brown, blackish brown, dark brown
Lustre:
Adamantine
Hardness:
5½
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.
Unique Identifiers
Mindat ID:
231
Long-form identifier:
mindat:1:1:231:4
IMA Classification of Angelellite
Classification of Angelellite
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
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
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
20 : Arsenates (also arsenates with phosphate, but without other anions)
9 : Arsenates of Fe
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Agl | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Ang | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Angelellite
Adamantine
Transparency:
Translucent
Colour:
Reddish brown, blackish brown, dark brown
Streak:
Reddish brown
Hardness:
5½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
{001}
{001}
Fracture:
Conchoidal
Density:
4.867 g/cm3 (Measured) 4.862 g/cm3 (Calculated)
Optical Data of Angelellite
Type:
Biaxial (+)
RI values:
nα = 2.13 nβ = 2.20 nγ = 2.40
Birefringence:
0.27
Max. Birefringence:
δ = 0.270
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
No measured or calculated 2V is on file for this mineral, so the value used here (66°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
No measured or calculated 2V is on file for this mineral, so the value used here (66°) is estimated from its recorded refractive indices and optic sign, not from a direct 2V measurement.
Dispersion:
r < v
Pleochroism:
Strong
Comments:
Deep blood red to reddish brown.
Chemistry of Angelellite
Mindat Formula:
Fe3+4(AsO4)2O3
Element Weights:
Elements listed:
Crystallography of Angelellite
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°
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
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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CIF File Best | x | y | z | a | b | c
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Rotation
Stop | Start
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Labels
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0014707 | Angelellite | Moore P B, Araki T (1978) Angelellite, Fe4O3(AsO4)2: a novel cubic close-packed oxide structure Neues Jahrbuch fur Mineralogie, Abhandlungen 132 91-100 | 1978 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.29 Å | (30) |
| 3.152 Å | (100) |
| 2.997 Å | (70) |
| 2.960 Å | (40) |
| 2.955 Å | (40) |
| 2.856 Å | (50) |
| 2.489 Å | (50) |
| 2.072 Å | (50) |
Comments:
ICDD 13-121
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 46 : Near-surface hydrothermal alteration of minerals (see also #22) |
Type Occurrence of Angelellite
General Appearance of Type Material:
Dark brown incrustations with a high luster.
Place of Conservation of Type Material:
Institut für Mineralogie und Kristallographie, Technische Universität, Berlin, Germany, number 94/28.
Geological Setting of Type Material:
Fumarole associated with tin mineralization.
Associated Minerals at Type Locality:
Other Language Names for Angelellite
Dutch:Angelelliet
French:Angelellite
German:Angelellit
Norwegian:Angelellitt
Russian:Ангелеллит
Simplified Chinese:脆砷铁矿
Spanish:Angelellita
Related Minerals - Strunz-mindat Grouping
| 8.BC. | Manganrockbridgeite | Mn2+2Fe3+3(PO4)3(OH)4(H2O) |
| 8.BC. | Elaliite | (Fe2+8Fe3+)(PO4)O8 |
| 8.BC. | Elkinstantonite | Fe4(PO4)2O |
| 8.BC.05 | Leybovite-K | KCuNa(MgFe3+)(AsO4)3 |
| 8.BC.10 | Frondelite | (Mn2+0.5Fe3+0.5)2Fe3+3(PO4)3(OH)5 |
| 8.BC.10 | Rockbridgeite | (Fe2+0.5Fe3+0.5)2Fe3+3(PO4)3(OH)5 |
| 8.BC.10 | Ferrirockbridgeite | (Fe3+0.67◻0.33)2(Fe3+)3(PO4)3(OH)4(H2O) |
| 8.BC.10 | Ferrorockbridgeite | (Fe2+,Mn2+)2(Fe3+)3(PO4)3(OH)4(H2O) |
| 8.BC.10 | Plimerite | ZnFe3+4(PO4)3(OH)5 |
| 8.BC.15 | Aerugite | Ni8.5(AsO4)2As5+O8 |
Fluorescence of Angelellite
Not fluorescent
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Angelellite
mindat.org URL:
https://www.mindat.org/min-231.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Angelellite
Reference List:
Majzlan, Juraj, Nielsen, Ulla Gro, Dachs, Edgar, Benisek, Artur, Drahota, Petr, Kolitsch, Uwe, Herrmann, Julia, Bolanz, Ralph, Števko, Martin (2018) Thermodynamic properties of mansfieldite (AlAsO4·2H2O), angelellite (Fe4(AsO4)2O3) and kamarizaite (Fe3(AsO4)2(OH)3·3H2O) Mineralogical Magazine, 82 (6) 1333-1354 doi:10.1180/mgm.2018.107
Localities for Angelellite
Showing 4 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Argentina (TL) | |
| Neues Jahrb.Mineral. (1959) +1 other reference |
Bolivia | |
| Torró et al. (2019) |
Canada | |
| Sparkes et al. (2016) |
China | |
| Suiliang Dong et al. (2010) +1 other reference |
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Veta Yareta Mine, Cerro Pululos, Rinconada Department, Jujuy Province, Argentina