Mindat Logo
Home Page Log In Message Board The Mindat Directory
Register Search Pages Chat Now! (2 online) Mindat Auctions

Magnesiodumortierite

Big Photo

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)
mindat.org URL:http://www.mindat.org/min-2473.html
Please feel free to link to this page.

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,REE)
 
2
(□,Fe
2+
 
)Be
 
2
[SiO
 
4
]
 
2
(OH)
 
2
9.AJ.20Hingganite-(Y)
(Y,REE,Ca)
 
2
(□,Fe
2+
 
)Be
 
2
[SiO
 
4
]
 
2
(OH)
 
2
9.AJ.20Hingganite-(Yb)
(Yb,Y,REE)
 
2
□Be
 
2
[SiO
 
4
]
 
2
(OH)
 
2
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
(□,Fe
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

Search Engines:
  • Look for Magnesiodumortierite on Google
  • Look for Magnesiodumortierite images on Google
    • External Links:
  • Look for Magnesiodumortierite on Webmineral
  • Look for Magnesiodumortierite on Athena Mineralogy
  • Look for Magnesiodumortierite on Wikipedia
  • Look for Magnesiodumortierite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Magnesiodumortierite in the Natural History Museum (London) online catalogue
    • Mineral Dealers:
  • Wright's Rock Shop - excellent mineral specimens since 1970
  • Buy minerals from Mineralium.com
  • Wendel Minerals - Auktion & Shop
  • Top quality minerals from Kristalle of California
  • Buy fine minerals and gemstones from Pala International
  • High-end worldwide specimens & outstanding customer service
  • The Arkenstone - Fine Minerals
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • Search for - Magnesiodumortierite - on e-Rocks Mineral Sales & Auctions
  • Fabre Minerals - search for Magnesiodumortierite specimens
  • Fine Minerals from Dan Weinrich Minerals
  • SpiriferMinerals.com - high quality specimens
    • Jobs:
  • Mining & Geology Jobs

    • Page Sponsor

    Sponsorship:This page is currently not sponsored. Click here to sponsor this page.

    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
    Google
     
    www.mindat.org Web
    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 12th Oct 2009 13:41:23