Magnesiodumortierite (original) (raw)
A valid IMA mineral species
About MagnesiodumortieriteHide
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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).
Specific Gravity:
3.22 (Calculated)
Crystal System:
Orthorhombic
Co-Type Localities:
ⓘ San Giacomo, Gilba Valley, Brossasco, Cuneo Province, Piedmont, Italy
ⓘ Case Ramello, Case Parigi, Martiniana Po, Cuneo Province, Piedmont, Italy
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:2473:6
fc9ea8a8-dda8-4741-aa53-0ee708495699
IMA Classification of MagnesiodumortieriteHide
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IMA Formula:
MgAl6BSi3O17(OH)
Type description reference:
Classification of MagnesiodumortieriteHide
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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
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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 MagnesiodumortieriteHide
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Cleavage:
Poor/Indistinct
very poor cleavage plane, parallel to [001]
Density:
3.22 g/cm3 (Calculated)
Optical Data of MagnesiodumortieriteHide
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RI values:
_n_α = 1.678(1) _n_β = 1.700 _n_γ = 1.701(1)
2V:
Measured: 38° (1), Calculated: 24°
δ = 0.023
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Comments:
X pale pink to red, Y and Z colourless;
Chemistry of MagnesiodumortieriteHide
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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
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Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Case Ramello, Case Parigi, Martiniana Po, Cuneo Province, Piedmont, Italy | Schertl, H. -P., Schreyer, W., Chopin, C. (1991) The pyrope-coesite rocks and their country rocks at Parigi, Dora Maira Massif, Western Alps: detailed petrography, mineral chemistry and PT-path. Contributions to Mineralogy and Petrology, 108 (1) 1-21 doi:10.1007/bf00307322 | 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 MagnesiodumortieriteHide
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Crystal System:
Orthorhombic
Class (H-M):
m m m _(_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)
Comment:
Space Group: Pmcn
Crystal StructureHide
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| 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 DiffractionHide
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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 EnvironmentHide
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Type Occurrence of MagnesiodumortieriteHide
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Co-Type Localities:
ⓘ San Giacomo, Gilba Valley, Brossasco, Cuneo Province, Piedmont, Italy
ⓘ Case Ramello, Case Parigi, Martiniana Po, Cuneo Province, Piedmont, Italy
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
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Other Language Names for MagnesiodumortieriteHide
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Relationship of Magnesiodumortierite to other SpeciesHide
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Other Members of this group:
| Dumortierite | Al(Al2O)(Al2O)2(SiO4)3(BO3) | Orth. m m m _(_2/_m_2/_m_2/m ) |
|---|
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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| 9.AJ. | Hingganite-(Nd) | Nd2◻Be2Si2O8(OH)2 | Mon. 2/m : _P_21/b |
|---|---|---|---|
| 9.AJ. | Arrheniusite-(Ce) | CaMg[(Ce7Y3)Ca5](SiO4)4(Si2B3AsO18)(BO3)F11 | Trig. 3_m_ : R_3_m |
| 9.AJ.05 | Grandidierite | (Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2 | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 9.AJ.05 | Ominelite | (Fe2+,Mg)(Al,Fe3+)3(SiO4)(BO3)O2 | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 9.AJ.10 | Dumortierite | Al(Al2O)(Al2O)2(SiO4)3(BO3) | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 9.AJ.10 | Holtite | (Ta0.6◻0.4)Al6BSi3O18(O,OH)2.25 | Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a |
| 9.AJ.10 | Nioboholtite | (Nb0.6◻0.4)Al6BSi3O18 | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c m |
| 9.AJ.10 | Titanoholtite | (Ti0.75◻0.25)Al6BSi3O18 | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c m |
| 9.AJ.15 | Garrelsite | Ba3NaSi2B7O16(OH)4 | Mon. 2/m : _B_2/b |
| 9.AJ.20 | Muromontite | near Be2FeY2Si3O12 | |
| 9.AJ.20 | Datolite | CaB(SiO4)(OH) | Mon. 2/m : _P_21/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 : _P_21/b |
| 9.AJ.20 | Hingganite-(Ce) | (Ce,REE)2(◻,Fe2+)Be2[SiO4]2(OH)2 | Mon. 2/m : _P_21/b |
| 9.AJ.20 | Hingganite-(Y) | (Y,REE,Ca)2(◻,Fe2+)Be2[SiO4]2(OH)2 | Mon. 2/m : _P_21/b |
| 9.AJ.20 | Hingganite-(Yb) | (Yb,Y,REE)2◻Be2[SiO4]2(OH)2 | Mon. 2/m : _P_21/b |
| 9.AJ.20 | Homilite | Ca2(Fe2+,Mg)B2Si2O10 | Mon. 2/m : _P_21/b |
| 9.AJ.20 | Melanocerite-(Ce) | (Ce,Ca)5(SiO4,BO4)3(OH,O) | Hex. |
| 9.AJ.20 | Minasgeraisite-(Y) | (Ca2Y2)◻2(Be2B2)[SiO4]4(OH)4 | Tric. 1 : _P_1 |
| 9.AJ.20 | Calcybeborosilite-(Y) | (Y,Ca)2(◻,Fe2+)(B,Be)2[SiO4]2(OH,O)2 | Mon. |
| 9.AJ.20 | Gadolinite-(Nd) | Nd2Fe2+Be2O2(SiO4)2 | Mon. 2/m : _P_21/b |
| 9.AJ.20 | Unnamed (OH-analogue of Gadolinite-(Y)) | (Y,Ca)2(Fe,◻)Be2Si2O8(OH,O)2 | Mon. 2/m |
| 9.AJ.25 | Stillwellite-(Ce) | (Ce,La,Ca)BSiO5 | Trig. 3 : _P_31 |
| 9.AJ.30 | Cappelenite-(Y) | Ba(Y,Ce)6Si3B6O24F2 | Trig. 3 : _P_3 |
| 9.AJ.35 | Okanoganite-(Y) | (Na,Ca)3(Y,Ce)12Si6B2O27F14 | Trig. 3_m_ : R_3_m |
| 9.AJ.35 | Vicanite-(Ce) | (Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7 | Trig. 3_m_ : R_3_m |
| 9.AJ.35 | Hundholmenite-(Y) | (Y,REE,Ca,Na)15(Al,Fe3+)(CaxAs3+1-x)(Si,As5+)Si6B3(O,F)48 | Trig. 3_m_ : R_3_m |
| 9.AJ.35 | Proshchenkoite-(Y) | Ca(Y,REE,Ca,Na,Mn)15Fe2+(P,Si)Si6B3O34F14 | Trig. 3_m_ : R_3_m |
| 9.AJ.35 | Laptevite-(Ce) | Ca6(Fe2+,Mn2+)Y3REE7(SiO4)3(PO4)(B3Si3O18)(BO3)F11 | Trig. 3_m_ : R_3_m |
| 9.AJ.40 | Jadarite | LiNaSiB3O7(OH) | Mon. 2/m |
Other InformationHide
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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
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References for MagnesiodumortieriteHide
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Localities for MagnesiodumortieriteHide
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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
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Locality ListHide
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