Magnesiobeltrandoite-2N3S (original) (raw)
A valid IMA mineral species
Formula:
(Mg6Al2)(Al18Fe3+2)O38(OH)2
Specific Gravity:
3.93 (Calculated)
The root-name beltrandoite honours Marco Beltrando (Ivrea, 10 december 1978 - Frassinetto, 8 december 2015), geologist and petrologist at the Department of Earth Sciences of the University of Torino, for his sound contributions to the evolution of the Alpine orogeny. During his too short but very brilliant career, he obtained very important scientific results, such as the recognition of hyper-extended margins in the collisional belt of the Western Alps and the heating-cooling cycles in rift systems. He was able to connect structural geology and tectonics with petrology, geochronology and stratigraphy. His great ability to link the observations at the micro-scale to those at the meso- and macro-scale allowed him to shed new light on the evolution of both extensional and collisional systems. His new and original ideas have made him one of the leaders of a new generation of Alpine geologists. It is very sad that Marco's life and brilliant career terminated so suddenly in the place where he felt best, in his beloved mountains." (Cámara et al., 2018).
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:50780:0
f838729f-348f-48c3-b792-c1d0990a17c8
IMA Classification of Magnesiobeltrandoite-2N3SHide
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IMA Formula:
(Mg6Al2)(Al18Fe3+2)O38(OH)2
Type description reference:
Cámara, Fernando, Cossio, Roberto, Regis, Daniele, Cerantola, Valerio, Ciriotti, Marco E., Compagnoni, Roberto (2018) Beltrandoite, a new root-name in the högbomite supergroup: the Mg end-member magnesiobeltrandoite-2N3S. European Journal of Mineralogy, 30 (3) 545-558 doi:10.1127/ejm/2017/0029-2692
Classification of Magnesiobeltrandoite-2N3SHide
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4.CB.20
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
C : Metal: Oxygen = 2: 3,3: 5, and similar
B : With medium-sized cations
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Mbt-2N3S | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Magnesiobeltrandoite-2N3SHide
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Comment:
Dark reddish-brown in thin section
Fracture:
Irregular/Uneven
Density:
3.93 g/cm3 (Calculated)
Optical Data of Magnesiobeltrandoite-2N3SHide
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Comments:
With ε = deep reddish brown (along c axis) and ω = reddish brown (⊥ c). Absorption is E > O.
Comments:
An estimated mean refractive index of ca. 1.80.
Chemistry of Magnesiobeltrandoite-2N3SHide
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Mindat Formula:
(Mg6Al2)(Al18Fe3+2)O38(OH)2
Crystallography of Magnesiobeltrandoite-2N3SHide
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Class (H-M):
3_m_ - Ditrigonal Pyramidal
Cell Parameters:
a = 5.7226(3) Å, c = 23.0231(9) Å
Unit Cell V:
652.95 ų (Calculated from Unit Cell)
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.858 Å | (42) |
| 2.735 Å | (51) |
| 2.484 Å | (46) |
| 2.427 Å | (100) |
| 1.568 Å | (29) |
| 1.514 Å | (30) |
| 1.438 Å | (42) |
| 1.429 Å | (72) |
Geological EnvironmentHide
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Type Occurrence of Magnesiobeltrandoite-2N3SHide
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General Appearance of Type Material:
As subhedral to euhedral black crystals (∼50–400μm) in a fine-grained chlorite matrix associated as inclusions to relict pre-Alpine hercynite spinels and dolomite in cm- to dm-long darker boudins, which are cut by corundum + clinochlore ± dolomite veins
Place of Conservation of Type Material:
Mineralogical collections of the Museo Regionale di Scienze Naturali, Sezione di Mineralogia, Petrografia e Geologia, via Giovanni Giolitti 36, I-10123 Torino, Italy (catalogue number M/U17182)
Empirical Formula of Type Material:
[Al18.36Mg3.96Fe2+2:52Fe3+2:08Ti0.56Cr0.40Zn0.06V3+0:03Mn0.02]Σ28O38(OH)2
Geological Setting of Type Material:
Magnesian chloritites of a metamorphosed layered mafic complex
Associated Minerals at Type Locality:
Reference:
Cámara, F., Cossio, R., Regis, D., Cerantola, V., Ciriotti, M.E., Compagnoni, R. (2018): Beltrandoite, a new root-name in the högbomite supergroup: the Mg end-member magnesiobeltrandoite-2N3S. European Journal of Mineralogy, 30: 545-558
Synonyms of Magnesiobeltrandoite-2N3SHide
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Relationship of Magnesiobeltrandoite-2N3S to other SpeciesHide
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Other Members of this group:
Related Minerals - Strunz-mindat GroupingHide
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| 4.CB. | Ferrohögbomite-2N2S | [(Fe2+,Mg,Zn,Al)3(Al,Ti,Fe3+)8O15(OH)]2 | Hex. 6_m_ m : P_63_m c |
|---|---|---|---|
| 4.CB. | Magnesiohögbomite-6N12S | Mg5Al11TiO23(OH) | Trig. 3_m_ _(_32/m ) : R_3_m |
| 4.CB. | Zhenruite | (MoO3)2 · H2O | Mon. 2/m : _P_21/m |
| 4.CB. | Pengite | (Pb8Sb3+3)Σ11Sb5+9O35 | Trig. 3_m_ _(_32/m ) : R_3_m |
| 4.CB. | Virgilluethite | MoO3 · H2O | Mon. 2/m : _P_21/b |
| 4.CB. | Oboniobite | Mg4Nb2O9 | Trig. 3_m_ _(_32/m ) : _P_3_c_1 |
| 4.CB.05 | Brizziite | NaSb5+O3 | Trig. 3 : _R_3 |
| 4.CB.05 | Corundum | Al2O3 | Trig. 3_m_ _(_32/m ) : R_3_c |
| 4.CB.05 | Ecandrewsite | (Zn,Fe2+,Mn2+)TiO3 | Trig. 3 : _R_3 |
| 4.CB.05 | Eskolaite | Cr2O3 | Trig. 3_m_ _(_32/m ) : R_3_c |
| 4.CB.05 | Geikielite | MgTiO3 | Trig. 3 : _R_3 |
| 4.CB.05 | Hematite | Fe2O3 | Trig. 3_m_ _(_32/m ) : R_3_c |
| 4.CB.05 | Ilmenite | Fe2+TiO3 | Trig. 3 : _R_3 |
| 4.CB.05 | Karelianite | V3+2O3 | Trig. 3_m_ _(_32/m ) : R_3_c |
| 4.CB.05 | Melanostibite | Mn2+2Fe3+Sb5+O6 | Trig. 3 : _R_3 |
| 4.CB.05 | Pyrophanite | Mn2+TiO3 | Trig. 3 : _R_3 |
| 4.CB.05 | Akimotoite | (Mg,Fe2+)SiO3 | Trig. 3 : _R_3 |
| 4.CB.05 | Auroantimonate | AuSbO3 | |
| 4.CB.05 | UM1998-11-O-AuHSb | Au+2Sb3+O2(OH) | |
| 4.CB.05 | Tistarite | Ti3+2O3 | Trig. 3_m_ _(_32/m ) : R_3_c |
| 4.CB.05 | Unnamed (Fe-Cr Oxide) | FeCrO3 | Trig. 3 : _R_3 |
| 4.CB.05 | Hemleyite | (Fe2+0.48Mg0.37Ca0.04Na0.04Mn2+0.03Al0.03Cr3+0.01)sum=1.00Si1.00O3 | Trig. 3 : _R_3 |
| 4.CB.10 | Avicennite | Tl2O3 | Iso. m_3(2/m_3) : I _a_3 |
| 4.CB.10 | Bixbyite-(Mn) | Mn3+2O3 | Iso. m_3(2/m_3) : I _a_3 |
| 4.CB.10 | Bixbyite-(Fe) | (Fe,Mn)2O3 | Iso. |
| 4.CB.15 | Armalcolite | (Mg,Fe2+)Ti2O5 | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 4.CB.15 | Sassite | Ti3+2Ti4+O5 | Orth. m m m _(_2/_m_2/_m_2/m ) : C m c m |
| 4.CB.15 | Pseudobrookite | Fe2TiO5 | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 4.CB.15 | Ferropseudobrookite | Fe2+Ti2O5 | Orth. m m m _(_2/_m_2/_m_2/m ) : C m c m |
| 4.CB.15 | Griffinite | Al2TiO5 | Orth. m m m _(_2/_m_2/_m_2/m ) : C m c m |
| 4.CB.15 | Pseudobrookite Group | ||
| 4.CB.20 | Zincohögbomite-2N2S | [(Zn,Al,Fe2+)3(Al,Fe3+,Ti)8O15(OH)]2 | Hex. 6_m_ m : P_63_m c |
| 4.CB.20 | Zincohögbomite-2N6S | [(Zn,Mg)7(Al,Fe3+,Ti)16O31(OH)]2 | Hex. 6_m_ m : P_63_m c |
| 4.CB.20 | Magnesiohögbomite-6N6S | [(Mg,Fe2+)3(Al,Ti,Fe3+)8O15(OH)]6 | Trig. 3_m_ _(_32/m ) : R_3_m |
| 4.CB.20 | Magnesiohögbomite-2N3S | [(Mg,Fe2+,Zn)4(Al,Ti,Fe3+)10O19(OH)]2 | Trig. 3_m_ _(_32/m ) : P_31_m |
| 4.CB.20 | Magnesiohögbomite-2N2S | [(Mg,Fe2+)3[Al7(Ti,Fe3+)]O15(OH)]2 | Hex. 6_m_ m : P_63_m c |
| 4.CB.20 | Ferrohögbomite-6N12S | [(Fe2+,Mg,Zn)5(Al,Ti,Fe3+)12O23(OH)]6 | Trig. 3_m_ _(_32/m ) : R_3_m |
| 4.CB.20 | Magnesiohögbomite-2N4S | (Mg8.43Fe2+1.57)sum=10Al22Ti4+2O46(OH)2 | Hex. 6_m_ m : P_63_m c |
| 4.CB.20 | Zincovelesite-6N6S | Zn3(Fe3+,Mn3+,Al,Ti)8O15(OH) | Trig. 3_m_ _(_32/m ) : _P_3_m_1 |
| 4.CB.25 | Pseudorutile | Fe2Ti3O9 | Hex. 622 : _P_6322 |
| 4.CB.25 | Kleberite | FeTi6O11(OH)5 | Mon. 2/m : _P_21/b |
| 4.CB.30 | Berdesinskiite | V3+2TiO5 | Mon. |
| 4.CB.30 | Oxyvanite | V3+2V4+O5 | Mon. 2/m : _B_2/b |
| 4.CB.30 | Kaitianite | Ti3+2Ti4+O5 | Mon. 2/m : _B_2/b |
| 4.CB.35 | Olkhonskite | (Cr,V)2Ti3O9 | Mon. |
| 4.CB.35 | Schreyerite | V3+2Ti4+3O9 | Mon. 2/m : _B_2/b |
| 4.CB.35 | Machiite | Al2Ti3O9 | Mon. 2/m : _B_2/b |
| 4.CB.35 | Vestaite | (Ti4+Fe2+)Ti4+3O9 | Mon. 2/m : _B_2/b |
| 4.CB.40 | Kamiokite | Fe2Mo3O8 | Hex. 6_m_ m : P_63_m c |
| 4.CB.40 | Nolanite | V3+8Fe3+2O14(OH)2 | Hex. 6_m_ m : P_63_m c |
| 4.CB.40 | Rinmanite | Zn2Sb2Mg2Fe4O14(OH)2 | Hex. 6 : _P_63 |
| 4.CB.40 | Iseite | Mn2Mo3O8 | Hex. 6_m_ m : P_63_m c |
| 4.CB.40 | Majindeite | Mg2Mo3O8 | Hex. 6_m_ m : P_63_m c |
| 4.CB.40 | Zincorinmanite-(Zn) | Zn2Sb2(Fe3+4Zn2)O14(OH)2 | Hex. 6_m_ m : P_63_m c |
| 4.CB.45 | Claudetite | As2O3 | Mon. 2/m |
| 4.CB.45 | Stibioclaudetite | AsSbO3 | Mon. 2/m : _P_21/m |
| 4.CB.50 | Arsenolite | As2O3 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 4.CB.50 | Senarmontite | Sb2O3 | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 4.CB.55 | Valentinite | Sb2O3 | Orth. m m m _(_2/_m_2/_m_2/m ) : P c c n |
| 4.CB.60 | Bismite | Bi2O3 | Mon. 2/m : _P_21/b |
| 4.CB.65 | Sphaerobismoite | Bi2O3 | Tet. |
| 4.CB.70 | Sillénite | Bi12SiO20 | Iso. 23 : _I_23 |
| 4.CB.75 | Kyzylkumite | V3+Ti2O5(OH) | Mon. 2/m : _P_21/b |
| 4.CB.80 | Tietaiyangite | Fe3+4Fe2+TiO9 | Hex. |
| 4.CB.85 | Liuite | FeTiO3 | Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a |
| 4.CB.90 | Luogufengite | Fe2O3 | Orth. m _m_2 : P n _a_21 |
| 4.CB.95 | Wangdaodeite | FeTiO3 | Trig. 3_m_ : R_3_c |
Fluorescence of Magnesiobeltrandoite-2N3SHide
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No fluorescence under UV radiation and no cathodoluminescence.
Other InformationHide
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IR Spectrum:
The Raman spectrum shows a weak and strongly polarized broad OH-characteristic absorption centred at 3364 cm-1.
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 Magnesiobeltrandoite-2N3SHide
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References for Magnesiobeltrandoite-2N3SHide
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Reference List:
Cámara, Fernando, Cossio, Roberto, Regis, Daniele, Cerantola, Valerio, Ciriotti, Marco E., Compagnoni, Roberto (2018) Beltrandoite, a new root-name in the högbomite supergroup: the Mg end-member magnesiobeltrandoite-2N3S. European Journal of Mineralogy, 30 (3) 545-558 doi:10.1127/ejm/2017/0029-2692
Localities for Magnesiobeltrandoite-2N3SHide
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This 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.
Locality ListHide
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- 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). 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
| Italy (TL) | |
|---|---|
| Aosta Valley Torgnon ⓘ Marmore stream (TL) | Mineralogical Magazine +3 other references |