Magnesiodumortierite
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Formula:
(Mg,Ti,◻(Al,Mg)2Al4Si3O18-y(OH)yB y = 2-3
Colour:
Pink to red
Lustre:
Vitreous
Hardness:
7 - 8
Crystal System:
Orthorhombic
Member of:
Classification of Magnesiodumortierite
Approved
8/B.31-15
9.AJ.10
9 : SILICATES (Germanates)
A : Nesosilicates
J : Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra, cornersharing with SiO4
9 : SILICATES (Germanates)
A : Nesosilicates
J : Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra, cornersharing with SiO4
54.1.2.2
54 : NESOSILICATES Borosilicates and Some Beryllosilicates
1 : Borosilicates and Some Beryllosilicates with (BO3)
54 : NESOSILICATES Borosilicates and Some Beryllosilicates
1 : Borosilicates and Some Beryllosilicates with (BO3)
Physical Properties of Magnesiodumortierite
Optical Data of Magnesiodumortierite
Type:
Biaxial (-)
RI values:
nα = 1.678 nβ = 1.700 nγ = 1.701
2V:
Measured: 38° , Calculated: 22°
Max Birefringence:
δ = 0.023

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r >> v strong
Chemical Properties of Magnesiodumortierite
Formula:
(Mg,Ti,◻(Al,Mg)2Al4Si3O18-y(OH)yB y = 2-3
IMA Formula:
MgAl6BSi3O17(OH)
Crystallography of Magnesiodumortierite
Crystal System:
Orthorhombic
Cell Parameters:
a = 11.91 Å, b = 20.4 Å, c = 4.73 Å
Ratio:
a:b:c = 0.584 : 1 : 0.232
Unit Cell V:
1,149.22 ų (Calculated from Unit Cell)
Type Occurrence of Magnesiodumortierite
Synonyms of Magnesiodumortierite
Other Language Names for Magnesiodumortierite
Relationship of Magnesiodumortierite to other Species
Common Associates
Associated Minerals Based on Photo Data:
Kyanite | 5 photos of Magnesiodumortierite associated with Kyanite on mindat.org. |
Cordierite | 5 photos of Magnesiodumortierite associated with Cordierite on mindat.org. |
Talc | 5 photos of Magnesiodumortierite associated with Talc on mindat.org. |
Quartz | 3 photos of Magnesiodumortierite associated with Quartz on mindat.org. |
Rutile | 1 photo of Magnesiodumortierite associated with Rutile on mindat.org. |
Related Minerals - Nickel-Strunz Grouping
9.AJ.05 | Grandidierite | (Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2 | Orth. mmm (2/m 2/m 2/m) |
9.AJ.05 | Ominelite | (Fe2+,Mg)(Al,Fe3+)3(SiO4)(BO3)O2 | Orth. mmm (2/m 2/m 2/m) |
9.AJ.10 | Dumortierite | (Al,Fe3+)7(SiO4)3(BO3)O3 | Orth. mmm (2/m 2/m 2/m) |
9.AJ.10 | Holtite | (Ta0.6◻0.4)Al6BSi3O18(O,OH)2.25 | Orth. mmm (2/m 2/m 2/m) : Pnma |
9.AJ.15 | Garrelsite | Ba3NaSi2B7O16(OH)4 | Mon. |
9.AJ.20 | Bakerite | Ca4(H5B5Si3O20) | Mon. 2/m : P21/b |
9.AJ.20 | Datolite | CaB(SiO4)(OH) | Mon. 2/m : P21/b |
9.AJ.20 | Gadolinite-(Ce) | (Ce,La,Nd,Y)2Fe2+Be2Si2O10 | Mon. 2/m |
9.AJ.20 | Gadolinite-(Y) | Y2Fe2+Be2Si2O10 | Mon. 2/m : P21/b |
9.AJ.20 | Hingganite-(Ce) | (Ce,REE)2(□,Fe2+)Be2[SiO4]2(OH)2 | Mon. 2/m : P21/b |
9.AJ.20 | Hingganite-(Y) | (Y,REE,Ca)2(□,Fe2+)Be2[SiO4]2(OH)2 | Mon. 2/m : P21/b |
9.AJ.20 | Hingganite-(Yb) | (Yb,Y,REE)2□Be2[SiO4]2(OH)2 | |
9.AJ.20 | Homilite | Ca2(Fe2+,Mg)B2Si2O10 | Mon. |
9.AJ.20 | Melanocerite-(Ce) | (Ce,Ca)5(SiO4,BO4)3(OH,0) | Hex. |
9.AJ.20 | Minasgeraisite-(Y) | CaBe2Y2Si2O10 | Mon. 2/m : P21/b |
9.AJ.20 | Calcybeborosilite-(Y) | (Y,Ca)2(□,Fe2+)(B,Be)2[SiO4]2(OH,O)2 | Mon. |
9.AJ.25 | Stillwellite-(Ce) | (Ce,La,Ca)BSiO5 | |
9.AJ.30 | Cappelenite-(Y) | Ba(Y,Ce)6Si3B6O24F2 | Trig. 3 : P3 |
9.AJ.35 | Okanoganite-(Y) | (Na,Ca)3(Y,Ce)12Si6B2O27F14 | |
9.AJ.35 | Vicanite-(Ce) | (Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7 | Trig. |
9.AJ.35 | Hundholmenite-(Y) | (Y,REE,Ca,Na)15(Al,Fe3+)(CaxAs3+1-x)(Si,As5+)Si6B3(O,F)48 | Trig. 3m : R3m |
9.AJ.35 | Proshchenkoite-(Y) | Ca(Y,REE,Ca,Na,Mn)15Fe2+(P,Si)Si6B3O34F14 | Trig. 3m : R3m |
9.AJ.40 | Jadarite | LiNaSiB3O7(OH) | Mon. 2/m |
Related Minerals - Dana Grouping (8th Ed.)
54.1.2.1 | Dumortierite | (Al,Fe3+)7(SiO4)3(BO3)O3 | Orth. mmm (2/m 2/m 2/m) |
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.
References for Magnesiodumortierite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Mineralogical Record: 27: 303.
Ferraris G, Ivaldi G, Chopin C (1995): Magnesiodumortierite, a new mineral from very-high-pressure rocks (Western Alps). Part I: Crystal structure. European Journal of Mineralogy 7, 167-174.
Chopin C, Ferraris G, Ivaldi G, Schertl H P, Schreyer W, Compagnoni R, Davidson C, Davis A M (1995): Magnesiodumortierite, a new mineral from very-high-pressure rocks (western Alps). II. Crystal chemistry and petrological significance. European Journal of Mineralogy 7, 525-535.
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).
Evans R J, Groat L A (2012): Structure and topology of dumortierite and dumortierite-like materials. The Canadian Mineralogist 50, 1197-1231.
Internet Links for Magnesiodumortierite
mindat.org URL:
https://www.mindat.org/min-2473.html
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Please feel free to link to this page.
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Localities for Magnesiodumortierite
Locality List




All localities listed without proper references should be considered as questionable.
Italy | |
| [European Journal of Mineralogy(1995) 7, 525-535; MinRec 27:303] |
| Piccoli, G.C., Maletto, G., Bosio, P., Lombardo, B. (2007). Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp. |
| Chopin C, Ferraris G, Ivaldi G, Schertl H P, Schreyer W, Compagnoni R, Davidson C, Davis A M (1995): Magnesiodumortierite, a new mineral from very-high-pressure rocks (western Alps). II. Crystal chemistry and petrological significance. European Journal of Mineralogy 7, 525-535. |
| Chopin C, Ferraris G, Ivaldi G, Schertl H P, Schreyer W, Compagnoni R, Davidson C, Davis A M (1995): Magnesiodumortierite, a new mineral from very-high-pressure rocks (western Alps). II. Crystal chemistry and petrological significance. European Journal of Mineralogy 7, 525-535. |
Norway | |
| Visser, D. and A. Senior (1991):Mg-rich dumortierite in cordierite-orthoamphibole-bearing rocks from the high-grade Bamble Sector, south Norway. Mineralogical Magazine 55, 563-577 |
| Jan Kihle Specimen |
Kihle, J.B. (2013): World's greatest cordierite find? Norsk Bergverksmuseum Skrifter. 50, 59-62 | |
| E.S. Grew & L.M. Anovitz: BORON, Reviews in Mineralogy vol. 33 p. 397 |
Jan Kihle photos & identification. |
Dora Maira coesite-bearing unit, Cuneo Province, Piedmont, Italy