Magnesiobeltrandoite-2N3S
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
Marco Beltrando
Formula:
(Mg6Al2)(Al18Fe3+2)O38(OH)2
Colour:
Black
Lustre:
Vitreous
Hardness:
6 - 6½
Specific Gravity:
3.93 (Calculated)
Crystal System:
Trigonal
Member of:
Type Locality:
Isostructural with:
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 Identifiers
Mindat ID:
50780
Long-form identifier:
mindat:1:1:50780:0
GUID
(UUID V4):
(UUID V4):
f838729f-348f-48c3-b792-c1d0990a17c8
IMA Classification of Magnesiobeltrandoite-2N3S
Approved
IMA Formula:
(Mg6Al2)(Al18Fe3+2)O38(OH)2
Approval year:
2016
First published:
2018
Classification of Magnesiobeltrandoite-2N3S
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
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 Symbols
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-2N3S
Vitreous
Colour:
Black
Comment:
Dark reddish-brown in thin section
Streak:
Dark brown
Hardness:
6 - 6½ on Mohs scale
Comment:
≈6–6½
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
3.93 g/cm3 (Calculated)
Optical Data of Magnesiobeltrandoite-2N3S
Type:
Uniaxial (-)
Pleochroism:
Weak
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-2N3S
Mindat Formula:
(Mg6Al2)(Al18Fe3+2)O38(OH)2
Crystallography of Magnesiobeltrandoite-2N3S
Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
P3m1
Cell Parameters:
a = 5.7226(3) Å, c = 23.0231(9) Å
Ratio:
a:c = 1 : 4.023
Unit Cell V:
652.95 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction
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 Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 26 : Hadean detrital minerals |
Type Occurrence of Magnesiobeltrandoite-2N3S
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-2N3S
Relationship of Magnesiobeltrandoite-2N3S to other Species
Member of:
Other Members of this group:
| Högbomite Group | A group of the Högbomite Supergroup. | |
| Nigerite Group | A group of the Högbomite Supergroup where Sn is the dominant tetravalent cation in the nolanite module. | |
| Taaffeite Group | A group of the Högbomite Supergroup with minerals that is composed of spinel and modified nolanite modules ... | |
| Zincovelesite-6N6S | Zn3(Fe3+,Mn3+,Al,Ti)8O15(OH) | Trig. 3m (3 2/m) : P3m1 |
Related Minerals - Strunz-mindat Grouping
| 4.CB. | Ferrohögbomite-2N2S | [(Fe2+,Mg,Zn,Al)3(Al,Ti,Fe3+)8O15(OH)]2 |
| 4.CB. | Magnesiohögbomite-6N12S | Mg5Al11TiO23(OH) |
| 4.CB. | Zhenruite | (MoO3)2 · H2O |
| 4.CB. | Pengite | (Pb8Sb3+3)Σ11Sb5+9O35 |
| 4.CB. | Virgilluethite | MoO3 · H2O |
| 4.CB.05 | Brizziite | NaSb5+O3 |
| 4.CB.05 | Corundum | Al2O3 |
| 4.CB.05 | Ecandrewsite | (Zn,Fe2+,Mn2+)TiO3 |
| 4.CB.05 | Eskolaite | Cr2O3 |
| 4.CB.05 | Geikielite | MgTiO3 |
| 4.CB.05 | Hematite | Fe2O3 |
| 4.CB.05 | Ilmenite | Fe2+TiO3 |
| 4.CB.05 | Karelianite | V3+2O3 |
| 4.CB.05 | Melanostibite | Mn2+2Fe3+Sb5+O6 |
| 4.CB.05 | Pyrophanite | Mn2+TiO3 |
| 4.CB.05 | Akimotoite | (Mg,Fe2+)SiO3 |
| 4.CB.05 | Auroantimonate | AuSbO3 |
| 4.CB.05 | UM1998-11-O-AuHSb | Au+2Sb3+O2(OH) |
| 4.CB.05 | Tistarite | Ti3+2O3 |
| 4.CB.05 | Unnamed (Fe-Cr Oxide) | FeCrO3 |
| 4.CB.05 | Hemleyite | (Fe2+0.48Mg0.37Ca0.04Na0.04Mn2+0.03Al0.03Cr3+0.01)sum=1.00Si1.00O3 |
| 4.CB.10 | Avicennite | Tl2O3 |
| 4.CB.10 | Bixbyite-(Mn) | Mn3+2O3 |
| 4.CB.10 | Bixbyite-(Fe) | (Fe,Mn)2O3 |
| 4.CB.15 | Armalcolite | (Mg,Fe2+)Ti2O5 |
| 4.CB.15 | Sassite | Ti3+2Ti4+O5 |
| 4.CB.15 | Pseudobrookite | Fe2TiO5 |
| 4.CB.15 | Ferropseudobrookite | Fe2+Ti2O5 |
| 4.CB.15 | Griffinite | Al2TiO5 |
| 4.CB.15 | Pseudobrookite Group | |
| 4.CB.20 | Zincohögbomite-2N2S | [(Zn,Al,Fe2+)3(Al,Fe3+,Ti)8O15(OH)]2 |
| 4.CB.20 | Zincohögbomite-2N6S | [(Zn,Mg)7(Al,Fe3+,Ti)16O31(OH)]2 |
| 4.CB.20 | Magnesiohögbomite-6N6S | [(Mg,Fe2+)3(Al,Ti,Fe3+)8O15(OH)]6 |
| 4.CB.20 | Magnesiohögbomite-2N3S | [(Mg,Fe2+,Zn)4(Al,Ti,Fe3+)10O19(OH)]2 |
| 4.CB.20 | Magnesiohögbomite-2N2S | [(Mg,Fe2+)3[Al7(Ti,Fe3+)]O15(OH)]2 |
| 4.CB.20 | Ferrohögbomite-6N12S | [(Fe2+,Mg,Zn)5(Al,Ti,Fe3+)12O23(OH)]6 |
| 4.CB.20 | Magnesiohögbomite-2N4S | (Mg8.43Fe2+1.57)sum=10Al22Ti4+2O46(OH)2 |
| 4.CB.20 | Zincovelesite-6N6S | Zn3(Fe3+,Mn3+,Al,Ti)8O15(OH) |
| 4.CB.25 | Pseudorutile | Fe2Ti3O9 |
| 4.CB.25 | Kleberite | FeTi6O11(OH)5 |
| 4.CB.30 | Berdesinskiite | V3+2TiO5 |
| 4.CB.30 | Oxyvanite | V3+2V4+O5 |
| 4.CB.30 | Kaitianite | Ti3+2Ti4+O5 |
| 4.CB.35 | Olkhonskite | (Cr,V)2Ti3O9 |
| 4.CB.35 | Schreyerite | V3+2Ti3O9 |
| 4.CB.35 | Machiite | Al2Ti3O9 |
| 4.CB.35 | Vestaite | (Ti4+Fe2+)Ti4+3O9 |
| 4.CB.40 | Kamiokite | Fe2Mo3O8 |
| 4.CB.40 | Nolanite | V3+8Fe3+2O14(OH)2 |
| 4.CB.40 | Rinmanite | Zn2Sb2Mg2Fe4O14(OH)2 |
| 4.CB.40 | Iseite | Mn2Mo3O8 |
| 4.CB.40 | Majindeite | Mg2Mo3O8 |
| 4.CB.45 | Claudetite | As2O3 |
| 4.CB.45 | Stibioclaudetite | AsSbO3 |
| 4.CB.50 | Arsenolite | As2O3 |
| 4.CB.50 | Senarmontite | Sb2O3 |
| 4.CB.55 | Valentinite | Sb2O3 |
| 4.CB.60 | Bismite | Bi2O3 |
| 4.CB.65 | Sphaerobismoite | Bi2O3 |
| 4.CB.70 | Sillénite | Bi12SiO20 |
| 4.CB.75 | Kyzylkumite | V3+Ti2O5(OH) |
| 4.CB.80 | Tietaiyangite | Fe3+4Fe2+TiO9 |
| 4.CB.85 | Liuite | FeTiO3 |
| 4.CB.90 | Luogufengite | Fe2O3 |
| 4.CB.95 | Wangdaodeite | FeTiO3 |
Fluorescence of Magnesiobeltrandoite-2N3S
No fluorescence under UV radiation and no cathodoluminescence.
Other Information
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-2N3S
mindat.org URL:
https://www.mindat.org/min-50780.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Magnesiobeltrandoite-2N3S
Localities for Magnesiobeltrandoite-2N3S
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.
Italy (TL) | |
| Mineralogical Magazine +3 other references |
Quick NavTopUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsRelationshipsStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
