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Magnesiodumortierite

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Magnesiodumortierite

Dora Maira coesite-bearing unit, Cuneo Province, Piedmont, Italy
Magnesiodumortierite

Pratolungo, Isasca valley, Venasca, Varaita Valley, Cuneo Province, Piedmont, Italy
Magnesiodumortierite, etc.

Magnesiodumortierite occurrence, Kragerø, Telemark, Norway
Magnesiodumortierite

Dora Maira coesite-bearing unit, Cuneo Province, Piedmont, Italy
Magnesiodumortierite

Pratolungo, Isasca valley, Venasca, Varaita Valley, Cuneo Province, Piedmont, Italy
Magnesiodumortierite, etc.

Magnesiodumortierite occurrence, Kragerø, Telemark, Norway
Magnesiodumortierite

Dora Maira coesite-bearing unit, Cuneo Province, Piedmont, Italy
Magnesiodumortierite

Pratolungo, Isasca valley, Venasca, Varaita Valley, Cuneo Province, Piedmont, Italy
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About MagnesiodumortieriteHide

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


Classification of MagnesiodumortieriteHide

IMA status:
Approved
Strunz 8th ed.:
8/B.31-15
Nickel-Strunz 10th (pending) ed.:
9.AJ.10

9 : SILICATES (Germanates)
A : Nesosilicates
J : Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra, cornersharing with SiO4
Dana 8th ed.:
54.1.2.2

54 : NESOSILICATES Borosilicates and Some Beryllosilicates
1 : Borosilicates and Some Beryllosilicates with (BO3)

Physical Properties of MagnesiodumortieriteHide

Lustre:
Vitreous
Colour:
Pink to red
Streak:
White
Hardness:
7 - 8 on Mohs scale

Optical Data of MagnesiodumortieriteHide

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 MagnesiodumortieriteHide

Formula:
(Mg,Ti,⃞(Al,Mg)2Al4Si3O18-y(OH)yB y = 2-3
IMA Formula:
MgAl6BSi3O17(OH)
Elements listed:
Al, B, H, Mg, O, Si - search for minerals with similar chemistry

Crystallography of MagnesiodumortieriteHide

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 MagnesiodumortieriteHide

Synonyms of MagnesiodumortieriteHide

Other Language Names for MagnesiodumortieriteHide

Relationship of Magnesiodumortierite to other SpeciesHide

Member of:
Dumortierite Group > Dumortierite Supergroup
Other Members of this group:
Dumortierite(Al,Fe3+)7(SiO4)3(BO3)O3Orth. mmm (2/m 2/m 2/m)

Common AssociatesHide

Associated Minerals Based on Photo Data:
Kyanite5 photos of Magnesiodumortierite associated with Kyanite on mindat.org.
Cordierite5 photos of Magnesiodumortierite associated with Cordierite on mindat.org.
Talc5 photos of Magnesiodumortierite associated with Talc on mindat.org.
Quartz3 photos of Magnesiodumortierite associated with Quartz on mindat.org.
Rutile1 photo of Magnesiodumortierite associated with Rutile on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.AJ.Hingganite-(Nd)(Nd,Y,Ce,Sm)2(⃞,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
9.AJ.05Grandidierite(Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2Orth. mmm (2/m 2/m 2/m)
9.AJ.05Ominelite(Fe2+,Mg)(Al,Fe3+)3(SiO4)(BO3)O2Orth. mmm (2/m 2/m 2/m)
9.AJ.10Dumortierite(Al,Fe3+)7(SiO4)3(BO3)O3Orth. mmm (2/m 2/m 2/m)
9.AJ.10Holtite(Ta0.6⃞0.4)Al6BSi3O18(O,OH)2.25Orth. mmm (2/m 2/m 2/m) : Pnma
9.AJ.15GarrelsiteBa3NaSi2B7O16(OH)4Mon.
9.AJ.20BakeriteCa4(H5B5Si3O20)Mon. 2/m : P21/b
9.AJ.20DatoliteCaB(SiO4)(OH)Mon. 2/m : P21/b
9.AJ.20Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10Mon. 2/m
9.AJ.20Gadolinite-(Y)Y2Fe2+Be2Si2O10Mon. 2/m : P21/b
9.AJ.20Hingganite-(Ce)(Ce,REE)2(□,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
9.AJ.20Hingganite-(Y)(Y,REE,Ca)2(□,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
9.AJ.20Hingganite-(Yb)(Yb,Y,REE)2□Be2[SiO4]2(OH)2
9.AJ.20HomiliteCa2(Fe2+,Mg)B2Si2O10Mon. 2/m : P21/b
9.AJ.20Melanocerite-(Ce)(Ce,Ca)5(SiO4,BO4)3(OH,0)Hex.
9.AJ.20Minasgeraisite-(Y)BiCa(Y,Ln)2(□,Mn)2(Be,B,Si)4Si4O16 [(OH),O]4Tric. 1 : P1
9.AJ.20Calcybeborosilite-(Y)(Y,Ca)2(□,Fe2+)(B,Be)2[SiO4]2(OH,O)2Mon.
9.AJ.25Stillwellite-(Ce)(Ce,La,Ca)BSiO5
9.AJ.30Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2Trig. 3 : P3
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+Si6B4O40F7Trig.
9.AJ.35Hundholmenite-(Y)(Y,REE,Ca,Na)15(Al,Fe3+)(CaxAs3+1-x)(Si,As5+)Si6B3(O,F)48Trig. 3m : R3m
9.AJ.35Proshchenkoite-(Y)Ca(Y,REE,Ca,Na,Mn)15Fe2+(P,Si)Si6B3O34F14Trig. 3m : R3m
9.AJ.40JadariteLiNaSiB3O7(OH)Mon. 2/m

Related Minerals - Dana Grouping (8th Ed.)Hide

54.1.2.1Dumortierite(Al,Fe3+)7(SiO4)3(BO3)O3Orth. mmm (2/m 2/m 2/m)

Other InformationHide

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 MagnesiodumortieriteHide

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 MagnesiodumortieriteHide

Localities for MagnesiodumortieriteHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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.
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