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Magnesiodumortierite

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Formula:
(Mg,Ti,◻(Al,Mg)2Al4Si3O18-y(OH)yB y = 2-3
System:
Orthorhombic
Colour:
Pink to red
Lustre:
Vitreous
Hardness:
7 - 8
The magnesium dominant analogue of Dumortierite.


Classification of Magnesiodumortierite

Approved
9.AJ.10

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)

Physical Properties of Magnesiodumortierite

Vitreous
Colour:
Pink to red
Streak:
White
Hardness (Mohs):
7 - 8

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.
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)
Elements listed in formula:

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 Volume:
V 1,149.22 ų (Calculated from Unit Cell)

Type Occurrence of Magnesiodumortierite

Relationship of Magnesiodumortierite to other Species

Other Members of Group:
Dumortierite(Al,Fe3+)7(SiO4)3(BO3)O3
9.AJ.05Grandidierite(Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2
9.AJ.05Ominelite(Fe2+,Mg)(Al,Fe3+)3(SiO4)(BO3)O2
9.AJ.10Dumortierite(Al,Fe3+)7(SiO4)3(BO3)O3
9.AJ.10Holtite(Ta0.60.4)Al6BSi3O18(O,OH)2.25
9.AJ.15GarrelsiteBa3NaSi2B7O16(OH)4
9.AJ.20BakeriteCa4(H5B5Si3O20)
9.AJ.20DatoliteCa(HBSiO5)
9.AJ.20Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10
9.AJ.20Gadolinite-(Y)Y2Fe2+Be2Si2O10
9.AJ.20Hingganite-(Ce)(Ce,REE)2(□,Fe2+)Be2[SiO4]2(OH)2
9.AJ.20Hingganite-(Y)(Y,REE,Ca)2(□,Fe2+)Be2[SiO4]2(OH)2
9.AJ.20Hingganite-(Yb)(Yb,Y,REE)2□Be2[SiO4]2(OH)2
9.AJ.20HomiliteCa2(Fe2+,Mg)B2Si2O10
9.AJ.20Melanocerite-(Ce)(Ce,Ca)5(SiO4,BO4)3(OH,0)
9.AJ.20Minasgeraisite-(Y)CaBe2Y2Si2O10
9.AJ.20Calcybeborosilite-(Y)(Y,Ca)2(□,Fe2+)(B,Be)2[SiO4]2(OH,O)2
9.AJ.25Stillwellite-(Ce)(Ce,La,Ca)BSiO5
9.AJ.30Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2
9.AJ.35Okanoganite-(Y)(Na,Ca)3(Y,Ce)12Si6B2O27F14
9.AJ.35Vicanite-(Ce)(Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7
9.AJ.35Hundholmenite-(Y)(Y,REE,Ca,Na)15(Al,Fe3+)(CaxAs3+1-x)(Si,As5+)Si6B3(O,F)48
9.AJ.35Proshchenkoite-(Y)Ca(Y,REE,Ca,Na,Mn)15Fe2+(P,Si)Si6B3O34F14
9.AJ.40JadariteLiNaSiB3O7(OH)

Other Names for Magnesiodumortierite

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:
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
Please feel free to link to this page.

Localities for Magnesiodumortierite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Italy
 
  • Piedmont
    • Cuneo Province
[European Journal of Mineralogy(1995) 7, 525-535; MinRec 27:303]
      • Po Valley
        • Martiniana Po
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.
      • Varaita Valley
        • Brossasco
          • Gilba Valley
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
 
  • Aust-Agder
    • Froland
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
    • Risør
Jan Kihle Specimen
Kihle, J.B. (2013): World's greatest cordierite find? Norsk Bergverksmuseum Skrifter. 50, 59-62
  • Telemark
E.S. Grew & L.M. Anovitz: BORON, Reviews in Mineralogy vol. 33 p. 397
Jan Kihle photos & identification.
Mineral and/or Locality  
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