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Magnesiodumortierite

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Dora Maira Massif, Cuneo Province, Piedmont, Italy
© loranth csanad

Show Magnesiodumortierite Photos (2)
Formula:
(Mg,Ti,[](Al,Mg)
 
2
Al
 
4
Si
 
3
O
 
18-y
(OH)
 
y
B y = 2-3
System:OrthorhombicColour:Pink to red
Lustre:VitreousHardness:7 - 8


The magnesium dominant analogue of Dumortierite.

Classification of Magnesiodumortierite

IMA status:Approved
Strunz 8th edition ID:8/B.31-15
Nickel-Strunz 10th (pending) edition ID: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 edition ID:54.1.2.2

54 : NESOSILICATES Borosilicates and Some Beryllosilicates
1 : Borosilicates and Some Beryllosilicates with (BO3)
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Type Occurrence of Magnesiodumortierite

Type Locality:Dora Maira Massif, Cuneo Province, Piedmont, Italy
Year of Discovery:1995

Physical Properties of Magnesiodumortierite

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

Crystallography of Magnesiodumortierite

Crystal System:Orthorhombic
Cell Parameters:a = 11.91Å, b = 20.4Å, c = 4.73Å
Ratio:a:b:c = 0.584 : 1 : 0.232
Unit Cell Volume:V 1,149.22 ų (Calculated from Unit Cell)

Optical Data of Magnesiodumortierite

Type:Biaxial (-)
RI values: nα = 1.678 nβ = 1.700 nγ = 1.701
2V:Measured: 38° , Calculated: 22°
Maximum Birefringence:δ = 0.023

Chart 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)
 
2
Al
 
4
Si
 
3
O
 
18-y
(OH)
 
y
B y = 2-3
Essential elements:Al, B, H, Mg, O, Si
All elements listed in formula:Al, B, H, Mg, O, Si, Ti

Relationship of Magnesiodumortierite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.AJ.05Grandidierite
(Mg,Fe
2+
 
)(Al,Fe
3+
 
)
 
3
[O
 
2
|BO
 
3
|SiO
 
4
]
9.AJ.05Ominelite
(Fe
2+
 
,Mg)(Al,Fe
3+
 
)
 
3
[O
 
2
|BO
 
3
|SiO
 
4
]
9.AJ.10Dumortierite
(Al,Fe
3+
 
)
 
7
[O
 
3
|BO
 
3
|(SiO
 
4
)
 
3
]
9.AJ.10Holtite
(Ta,Sb)Al
 
6
[O
 
3
|BO
 
3
|(SiO
 
4
)
 
3
]
9.AJ.15Garrelsite
Ba
 
3
NaSi
 
2
B
 
7
O
 
16
(OH)
 
4
9.AJ.20Bakerite
Ca
 
4
B
 
4
[(OH)
 
4
|HBO
 
4
|(SiO
 
4
)
 
3
]
9.AJ.20Datolite
CaB[OH|SiO
 
4
]
9.AJ.20Gadolinite-(Ce)
(Ce,La,Nd,Y)
 
2
Fe
2+
 
Be
 
2
[O|SiO
 
4
]
 
2
9.AJ.20Gadolinite-(Y)
Y
 
2
Fe
2+
 
Be
 
2
[O|SiO
 
4
]
 
2
9.AJ.20Hingganite-(Ce)
Ce
 
2
□Be
 
2
Si
 
2
O
 
8
(OH)
 
2
9.AJ.20Hingganite-(Y)
(Y,Yb,Er)Be[OH|SiO
 
4
]
9.AJ.20Hingganite-(Yb)
(Yb,Y)Be[OH|SiO
 
4
]
9.AJ.20Homilite
Ca
 
2
(Fe
2+
 
,Mg)B
 
2
[O|SiO
 
4
]
 
2
9.AJ.20Melanocerite-(Ce)
(Ce,Ca)
 
5
(Si,B)
 
3
O
 
12
(OH,F)·nH
 
2
O
9.AJ.20Minasgeraisite-(Y)
Y
 
2
CaBe
 
2
[O|SiO
 
4
]
 
2
9.AJ.20Calcybeborosilite-(Y)
(Y,Ca)
 
2
(B,Be)
 
2
[SiO
 
4
]
 
2
(OH,O)
 
2
9.AJ.25Stillwellite-(Ce)
(Ce,La,Ca)BSiO
 
5
9.AJ.30Cappelenite-(Y)
Ba(Y,Ce)
 
6
Si
 
3
B
 
6
O
 
24
F
 
2
9.AJ.35Okanoganite-(Y)
(Na,Ca)
 
3
(Y,Ce)
 
12
Si
 
6
B
 
2
O
 
27
F
 
14
9.AJ.35Vicanite-(Ce)
(Ca,Ce,La,Th)
 
15
As
5+
 
(As
3+
0.5
,Na
 
0.5
)Fe
3+
 
Si
 
6
B
 
4
O
 
40
F
 
7
9.AJ.35Hundholmenite-(Y)
(Y,REE,Ca,Na)
 
15
(Al,Fe
3+
 
)(Ca
 
x
As
3+
1-x
)(Si,As
5+
 
)Si
 
6
B
 
3
(O,F)
 
48
9.AJ.35Proshchenkoite-(Y)
(Y,REE,Ca,Na,Mn)
 
15
Fe
2+
 
Ca(P,Si)Si
 
6
B
 
3
O
 
34
F
 
14
9.AJ.40Jadarite
LiNaSiB
 
3
O
 
7
(OH)

Other Names for Magnesiodumortierite

Synonyms:
IMA1992-050
Other Languages:
German:Magnesiodumortierit
Russian:Магнезиодюмортьерит
Spanish:Magnesiodumortierita

Other Information

Health Warning: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.

European Journal of Mineralogy (1995): 7: 167-174, 525-535.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Internet Links for Magnesiodumortierite

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    Localities for Magnesiodumortierite

    (TL) indicates type locality. ? 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
    		[Eur.J.Min.(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.
    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
    Mineral and/or Locality
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