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Magnesiodumortierite

A valid IMA mineral species
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About MagnesiodumortieriteHide

Formula:
Mg(Al2OH)(Al2O)2(SiO4)3(BO3)
The given formula is the simplified end-member. Additional hydrogen incorporation is possible (compensated by additional Mg replacement of Al in the Al2(O,OH) structural unit, and/or ◻ replacement of Mg; see dumortierite).
Colour:
Pink to red
Lustre:
Vitreous
Hardness:
7 - 8
Specific Gravity:
3.22 (Calculated)
Crystal System:
Orthorhombic
The magnesium dominant analogue of Dumortierite.


Unique IdentifiersHide

Mindat ID:
2473
Long-form identifier:
mindat:1:1:2473:6
GUID
(UUID V4):
fc9ea8a8-dda8-4741-aa53-0ee708495699

IMA Classification of MagnesiodumortieriteHide

Classification of MagnesiodumortieriteHide

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)

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
MdumIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of MagnesiodumortieriteHide

Vitreous
Colour:
Pink to red
Streak:
White
Hardness:
7 - 8 on Mohs scale
Cleavage:
Poor/Indistinct
very poor cleavage plane, parallel to [001]
Density:
3.22 g/cm3 (Calculated)

Optical Data of MagnesiodumortieriteHide

Type:
Biaxial (-)
RI values:
nα = 1.678(1) nβ = 1.700 nγ = 1.701(1)
2V:
Measured: 38° (1), Calculated: 24°
Max Birefringence:
δ = 0.023
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r >> v strong
Pleochroism:
Weak
Comments:
X pale pink to red, Y and Z colourless;

Chemistry of MagnesiodumortieriteHide

Mindat Formula:
Mg(Al2OH)(Al2O)2(SiO4)3(BO3)

The given formula is the simplified end-member. Additional hydrogen incorporation is possible (compensated by additional Mg replacement of Al in the Al2(O,OH) structural unit, and/or ◻ replacement of Mg; see dumortierite).
Common Impurities:
Ti,Fe,P

Chemical AnalysisHide

Oxide wt%:
 1
SiO231.37 %
P2O50.03 %
TiO23.93 %
Al2O346.83 %
FeO0.12 %
MnO0.03 %
MgO8.69 %
CaO0.01 %
B2O36.06 %
Total:97.07 %
Sample references:
IDLocalityReferenceNotes
1Case Ramello, Case Parigi, Martiniana Po, Cuneo Province, Piedmont, ItalyThe analysis is published before magnesiodumortierite was published and the analysis was published as "dumortierite" by Schertl et al. (1991). The chemical composition of this sample however corresponds with magnesiodumortierite. The analysis is taken from an inclusion in a pyrope megacryst from a coesite-phengite-pyrope whiteschist.

Crystallography of MagnesiodumortieriteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 11.91(3) Å, b = 20.40(3) Å, c = 4.730(2) Å
Ratio:
a:b:c = 0.584 : 1 : 0.232
Unit Cell V:
1,149.22 ų (Calculated from Unit Cell)
Z:
4
Comment:
Space Group: Pmcn

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0006582MagnesiodumortieriteFerraris 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 7 167-17419950293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.89 Å(90)
5.84 Å(90)
5.09 Å(90)
3.87 Å(50)
3.827 Å(50)
3.450 Å(75)
3.227 Å(85)
2.926 Å(90)
2.546 Å(100)
2.100 Å(55)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
34 : Complex granite pegmatites

Type Occurrence of MagnesiodumortieriteHide

Place of Conservation of Type Material:
Museum national d'Histoire naturelle (Paris) and the Museo Regionale di Scienze Naturali (Torino, no. 93005.1/2).
Geological Setting of Type Material:
inclusions in pyrope megablasts of the coesite-bearing "whiteschists"
Associated Minerals at Type Locality:
Reference:
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.

Synonyms of MagnesiodumortieriteHide

Other Language Names for MagnesiodumortieriteHide

Relationship of Magnesiodumortierite to other SpeciesHide

Other Members of this group:
DumortieriteAl(Al2O)(Al2O)2(SiO4)3(BO3)Orth. mmm (2/m 2/m 2/m)

Common AssociatesHide

Associated Minerals Based on Photo Data:
5 photos of Magnesiodumortierite associated with KyaniteAl2(SiO4)O
5 photos of Magnesiodumortierite associated with Cordierite(Mg,Fe)2Al3(AlSi5O18)
5 photos of Magnesiodumortierite associated with TalcMg3Si4O10(OH)2
3 photos of Magnesiodumortierite associated with QuartzSiO2
1 photo of Magnesiodumortierite associated with RutileTiO2

Related Minerals - Strunz-mindat GroupingHide

9.AJ.Hingganite-(Nd)Nd2◻Be2Si2O8(OH)2Mon. 2/m : P21/b
9.AJ.Arrheniusite-(Ce)CaMg[(Ce7Y3)Ca5](SiO4)4(Si2B3AsO18)(BO3)F11Trig. 3m : R3m
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.10DumortieriteAl(Al2O)(Al2O)2(SiO4)3(BO3)Orth. mmm (2/m 2/m 2/m)
9.AJ.10Holtite(Ta0.60.4)Al6BSi3O18(O,OH)2.25Orth. mmm (2/m 2/m 2/m) : Pnma
9.AJ.10Nioboholtite(Nb0.60.4)Al6BSi3O18Orth. mmm (2/m 2/m 2/m) : Pbcm
9.AJ.10Titanoholtite(Ti0.750.25)Al6BSi3O18Orth. mmm (2/m 2/m 2/m) : Pbcm
9.AJ.15GarrelsiteBa3NaSi2B7O16(OH)4Mon. 2/m : B2/b
9.AJ.20Muromontitenear Be2FeY2Si3O12
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)2Mon. 2/m : P21/b
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)(Ca2Y2)◻2(Be2B2)[SiO4]4(OH)4Tric. 1 : P1
9.AJ.20Calcybeborosilite-(Y)(Y,Ca)2(◻,Fe2+)(B,Be)2[SiO4]2(OH,O)2Mon.
9.AJ.20Gadolinite-(Nd)Nd2Fe2+Be2O2(SiO4)2Mon. 2/m : P21/b
9.AJ.20Unnamed (OH-analogue of Gadolinite-(Y))(Y,Ca)2(Fe,◻)Be2Si2O8(OH,O)2Mon. 2/m
9.AJ.25Stillwellite-(Ce)(Ce,La,Ca)BSiO5Trig. 3 : P31
9.AJ.30Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2Trig. 3 : P3
9.AJ.35Okanoganite-(Y)(Na,Ca)3(Y,Ce)12Si6B2O27F14Trig. 3m : R3m
9.AJ.35Vicanite-(Ce)(Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7Trig. 3m : R3m
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.35Laptevite-(Ce)Ca6(Fe2+,Mn2+)Y3REE7(SiO4)3(PO4)(B3Si3O18)(BO3)F11Trig. 3m : R3m
9.AJ.40JadariteLiNaSiB3O7(OH)Mon. 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.

Internet Links for MagnesiodumortieriteHide

References for MagnesiodumortieriteHide

Reference List:

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 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)
 
  • Piedmont
    • Cuneo Province
      • Brossasco
        • Gilba Valley
      • Martiniana Po
      • Venasca
Norway
 
  • Agder
    • Froland
    • Risør
  • Vestfold og Telemark
 
Mineral and/or Locality  
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