Magnesiodumortierite
A valid IMA mineral species
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About Magnesiodumortierite
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
Member of:
Unique Identifiers
Mindat ID:
2473
Long-form identifier:
mindat:1:1:2473:6
GUID
(UUID V4):
(UUID V4):
fc9ea8a8-dda8-4741-aa53-0ee708495699
IMA Classification of Magnesiodumortierite
Approved
IMA Formula:
MgAl6BSi3O17(OH)
Classification of Magnesiodumortierite
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)
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 |
---|---|---|
Mdum | 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 Magnesiodumortierite
Vitreous
Colour:
Pink to red
Streak:
White
Hardness:
7 - 8 on Mohs scale
Cleavage:
Poor/Indistinct
very poor cleavage plane, parallel to [001]
very poor cleavage plane, parallel to [001]
Density:
3.22 g/cm3 (Calculated)
Optical Data of Magnesiodumortierite
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.
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 Magnesiodumortierite
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).
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 Analysis
Oxide wt%:
1 | |
---|---|
SiO2 | 31.37 % |
P2O5 | 0.03 % |
TiO2 | 3.93 % |
Al2O3 | 46.83 % |
FeO | 0.12 % |
MnO | 0.03 % |
MgO | 8.69 % |
CaO | 0.01 % |
B2O3 | 6.06 % |
Total: | 97.07 % |
Sample references:
ID | Locality | Reference | Notes |
---|---|---|---|
1 | Case Ramello, Case Parigi, Martiniana Po, Cuneo Province, Piedmont, Italy | The 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 Magnesiodumortierite
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 Structure
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2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0006582 | Magnesiodumortierite | 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 | 1995 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
34 : Complex granite pegmatites |
Type Occurrence of Magnesiodumortierite
Co-Type Localities:
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 Magnesiodumortierite
Other Language Names for Magnesiodumortierite
Relationship of Magnesiodumortierite to other Species
Member of:
Other Members of this group:
Dumortierite | Al(Al2O)(Al2O)2(SiO4)3(BO3) | Orth. mmm (2/m 2/m 2/m) |
Common Associates
Associated Minerals Based on Photo Data:
5 photos of Magnesiodumortierite associated with Kyanite | Al2(SiO4)O |
5 photos of Magnesiodumortierite associated with Cordierite | (Mg,Fe)2Al3(AlSi5O18) |
5 photos of Magnesiodumortierite associated with Talc | Mg3Si4O10(OH)2 |
3 photos of Magnesiodumortierite associated with Quartz | SiO2 |
1 photo of Magnesiodumortierite associated with Rutile | TiO2 |
Related Minerals - Strunz-mindat Grouping
9.AJ. | Hingganite-(Nd) | Nd2◻Be2Si2O8(OH)2 |
9.AJ. | Arrheniusite-(Ce) | CaMg[(Ce7Y3)Ca5](SiO4)4(Si2B3AsO18)(BO3)F11 |
9.AJ.05 | Grandidierite | (Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2 |
9.AJ.05 | Ominelite | (Fe2+,Mg)(Al,Fe3+)3(SiO4)(BO3)O2 |
9.AJ.10 | Dumortierite | Al(Al2O)(Al2O)2(SiO4)3(BO3) |
9.AJ.10 | Holtite | (Ta0.6◻0.4)Al6BSi3O18(O,OH)2.25 |
9.AJ.10 | Nioboholtite | (Nb0.6◻0.4)Al6BSi3O18 |
9.AJ.10 | Titanoholtite | (Ti0.75◻0.25)Al6BSi3O18 |
9.AJ.15 | Garrelsite | Ba3NaSi2B7O16(OH)4 |
9.AJ.20 | Muromontite | near Be2FeY2Si3O12 |
9.AJ.20 | Datolite | CaB(SiO4)(OH) |
9.AJ.20 | Gadolinite-(Ce) | (Ce,La,Nd,Y)2Fe2+Be2Si2O10 |
9.AJ.20 | Gadolinite-(Y) | Y2Fe2+Be2Si2O10 |
9.AJ.20 | Hingganite-(Ce) | (Ce,REE)2(◻,Fe2+)Be2[SiO4]2(OH)2 |
9.AJ.20 | Hingganite-(Y) | (Y,REE,Ca)2(◻,Fe2+)Be2[SiO4]2(OH)2 |
9.AJ.20 | Hingganite-(Yb) | (Yb,Y,REE)2◻Be2[SiO4]2(OH)2 |
9.AJ.20 | Homilite | Ca2(Fe2+,Mg)B2Si2O10 |
9.AJ.20 | Melanocerite-(Ce) | (Ce,Ca)5(SiO4,BO4)3(OH,0) |
9.AJ.20 | Minasgeraisite-(Y) | (Ca2Y2)◻2(Be2B2)[SiO4]4(OH)4 |
9.AJ.20 | Calcybeborosilite-(Y) | (Y,Ca)2(◻,Fe2+)(B,Be)2[SiO4]2(OH,O)2 |
9.AJ.20 | Gadolinite-(Nd) | Nd2Fe2+Be2O2(SiO4)2 |
9.AJ.20 | Unnamed (OH-analogue of Gadolinite-(Y)) | (Y,Ca)2(Fe,◻)Be2Si2O8(OH,O)2 |
9.AJ.25 | Stillwellite-(Ce) | (Ce,La,Ca)BSiO5 |
9.AJ.30 | Cappelenite-(Y) | Ba(Y,Ce)6Si3B6O24F2 |
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 |
9.AJ.35 | Hundholmenite-(Y) | (Y,REE,Ca,Na)15(Al,Fe3+)(CaxAs3+1-x)(Si,As5+)Si6B3(O,F)48 |
9.AJ.35 | Proshchenkoite-(Y) | Ca(Y,REE,Ca,Na,Mn)15Fe2+(P,Si)Si6B3O34F14 |
9.AJ.35 | Laptevite-(Ce) | Ca6(Fe2+,Mn2+)Y3REE7(SiO4)3(PO4)(B3Si3O18)(BO3)F11 |
9.AJ.40 | Jadarite | LiNaSiB3O7(OH) |
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.
Internet Links for Magnesiodumortierite
mindat.org URL:
https://www.mindat.org/min-2473.html
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References for Magnesiodumortierite
Reference List:
Localities for Magnesiodumortierite
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).
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.
All localities listed without proper references should be considered as questionable.
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Norway | |
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Magnesiodumortierite occurrence, Kragerø, Vestfold og Telemark, Norway