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Dumortierite

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Formula:
(Al,Fe3+)7(SiO4)3(BO3)O3
System:
Orthorhombic
Colour:
Blue, greenish-blue, ...
Lustre:
Vitreous
Hardness:
7 - 8
Name:
Named in honour of the French palaeontologist Eugène Dumortier (1801-1876) from Lyon.
Isostructural with:
Closely related to holtite.

Visit gemdat.org for gemological information about Dumortierite.

Classification of Dumortierite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
9.AJ.10

9 : SILICATES (Germanates)
A : Nesosilicates
J : Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra, cornersharing with SiO4
54.1.2.1

54 : NESOSILICATES Borosilicates and Some Beryllosilicates
1 : Borosilicates and Some Beryllosilicates with (BO3)
17.5.25

17 : Silicates Containing other Anions
5 : Borosilicates
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First Recorded Occurrence of Dumortierite

Year of Discovery:
1879

Occurrences of Dumortierite

Geological Setting:
In Al rich regionally metamorphosed rocks disseminated and in veinlets cutting schist, also in pegmatitic veins.

Physical Properties of Dumortierite

Vitreous
Diaphaneity (Transparency):
Translucent
Comment:
Vitreous to dull.
Colour:
Blue, greenish-blue, violet-blue, pale blue, pink, red
Hardness (Mohs):
7 - 8
Tenacity:
Brittle
Cleavage:
Distinct/Good
Distinct on {100}, poor on {110},
Parting:
parting on {001}
Density:
3.21 - 3.41 g/cm3 (Measured)    3.45 g/cm3 (Calculated)

Crystallography of Dumortierite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 11.828(1) Å, b = 20.243(3) Å, c = 4.7001(5) Å
Ratio:
a:b:c = 0.584 : 1 : 0.232
Unit Cell Volume:
V 1,125.36 ų (Calculated from Unit Cell)
Z:
4
Twinning:
Common on {110} sometimes producing trillings.
Comment:
Non-standard space group setting (Pmcn).
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Dumortierite

Type:
Biaxial (-)
RI values:
nα = 1.659 - 1.678 nβ = 1.684 - 1.691 nγ = 1.686 - 1.692
2V:
Measured: 20° to 52°, Calculated: 30°
Max Birefringence:
δ = 0.027
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v or r < v
Pleochroism:
Strong

Chemical Properties of Dumortierite

Formula:
(Al,Fe3+)7(SiO4)3(BO3)O3
Essential elements:
All elements listed in formula:
Common Impurities:
Fe,Ti,Mg,Ca

Relationship of Dumortierite to other Species

Other Members of Group:
Magnesiodumortierite(Mg,Ti,◻(Al,Mg)2Al4Si3O18-y(OH)yB y = 2-3
9.AJ.05Grandidierite(Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2
9.AJ.05Ominelite(Fe2+,Mg)(Al,Fe3+)3(SiO4)(BO3)O2
9.AJ.10Holtite(Ta0.60.4)Al6BSi3O18(O,OH)2.25
9.AJ.10Magnesiodumortierite(Mg,Ti,◻(Al,Mg)2Al4Si3O18-y(OH)yB y = 2-3
9.AJ.15GarrelsiteBa3NaSi2B7O16(OH)4
9.AJ.20BakeriteCa4(H5B5Si3O20)
9.AJ.20DatoliteCa(HBSiO5)
9.AJ.20Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10
9.AJ.20Gadolinite-(Y)Y2Fe2+Be2Si2O10
9.AJ.20Hingganite-(Ce)(Ce,REE)2(□,Fe2+)Be2[SiO4]2(OH)2
9.AJ.20Hingganite-(Y)(Y,REE,Ca)2(□,Fe2+)Be2[SiO4]2(OH)2
9.AJ.20Hingganite-(Yb)(Yb,Y,REE)2□Be2[SiO4]2(OH)2
9.AJ.20HomiliteCa2(Fe2+,Mg)B2Si2O10
9.AJ.20Melanocerite-(Ce)(Ce,Ca)5(SiO4,BO4)3(OH,0)
9.AJ.20Minasgeraisite-(Y)CaBe2Y2Si2O10
9.AJ.20Calcybeborosilite-(Y)(Y,Ca)2(□,Fe2+)(B,Be)2[SiO4]2(OH,O)2
9.AJ.25Stillwellite-(Ce)(Ce,La,Ca)BSiO5
9.AJ.30Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2
9.AJ.35Okanoganite-(Y)(Na,Ca)3(Y,Ce)12Si6B2O27F14
9.AJ.35Vicanite-(Ce)(Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7
9.AJ.35Hundholmenite-(Y)(Y,REE,Ca,Na)15(Al,Fe3+)(CaxAs3+1-x)(Si,As5+)Si6B3(O,F)48
9.AJ.35Proshchenkoite-(Y)Ca(Y,REE,Ca,Na,Mn)15Fe2+(P,Si)Si6B3O34F14
9.AJ.40JadariteLiNaSiB3O7(OH)
17.5.1ManandoniteLi2Al4(Si2AlB)O10(OH)8
17.5.2ReedmergneriteNa[BSi3O8]
17.5.3SearlesiteNa(H2BSi2O7)
17.5.4OleniteNa(Al3)Al6(Si6O18)(BO3)3O3(OH)
17.5.5ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
17.5.6KalborsiteK6Al4BSi6O20(OH)4Cl
17.5.7BoromuscoviteKAl2(BSi3O10)(OH)2
17.5.8PoudretteiteKNa2B3Si12O30
17.5.9LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
17.5.10DatoliteCa(HBSiO5)
17.5.11DanburiteCaB2Si2O8
17.5.12HowliteCa2B5SiO9(OH)5
17.5.13BakeriteCa4(H5B5Si3O20)
17.5.14OyeliteCa10Si8B2O29 · 12.5H2O
17.5.15KornerupineMg3Al6(Si,Al,B)5O21(OH)
17.5.16HarkeriteCa12Mg4Al(BO3)3(SiO4)4(CO3)5 · H2O
17.5.17Serendibite(Ca,Na)2(Mg,Fe2+)3(Al,Fe3+)3[O2|(Si,Al,B)6O18]
17.5.18Stillwellite-(Ce)(Ce,La,Ca)BSiO5
17.5.19Tadzhikite-(Ce)(Ca,Ce)4(Ce,Y)2(Ti4+,Fe3+,Al)[B4Si4O22](OH)2
17.5.20Melanocerite-(Ce)(Ce,Ca)5(SiO4,BO4)3(OH,0)
17.5.21Okanoganite-(Y)(Na,Ca)3(Y,Ce)12Si6B2O27F14
17.5.22Tritomite-(Ce)(Ce,La,Y,Th)5(Si,B)3(O,OH,F)13
17.5.23Tritomite-(Y)(Y,Ca,La,Fe)5(Si,B,Al)3(O,OH,F)13
17.5.24Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2
17.5.26Holtite(Ta0.60.4)Al6BSi3O18(O,OH)2.25
17.5.27DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
17.5.28 Ferridravite
17.5.29Axinite-(Mg)Ca2MgAl2BSi4O15OH
17.5.30UviteCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
17.5.31GarrelsiteBa3NaSi2B7O16(OH)4
17.5.32TienshaniteKNa3Na6Ca2Ba6Mn6(Ti4+,Nb)6B12Si36O114(O,OH,F)11
17.5.33LeucospheniteBaNa4Ti2B2Si10O30
17.5.34TaramelliteBa4(Fe3+,Ti,Fe2+,Mg)4(B2Si8O27)O2Clx
17.5.35TitantaramelliteBa4(Ti,Fe3+,Fe2+,Mg)4(B2Si8O27)O2Clx
17.5.36NagashimaliteBa4(V,Ti)4B2Si8O27(O,OH)2Cl
17.5.37Chromium-draviteNa(Mg3)Cr63+(Si6O18)(BO3)3(OH)3(OH)
17.5.38WawayandaiteCa6Mn2BBe9Si6O23(OH,Cl)15
17.5.39Werdingite(Mg,Fe)2Al14Si4B4O37
17.5.40Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)
17.5.41Axinite
17.5.42Tinzenite(Ca,Mn2+)2Mn2+Al2BSi4O15(OH)
17.5.44SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
17.5.45Fluor-buergeriteNa(Fe33+)Al6(Si6O18)(BO3)3O3F
17.5.46FeruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH)
17.5.47Axinite-(Fe)Ca2Fe2+Al2BSi4O15OH
17.5.48HomiliteCa2(Fe2+,Mg)B2Si2O10
17.5.49Grandidierite(Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2
17.5.50Hyalotekite(Pb,Ba,K)4(Ca,Y)2(B,Be)2(Si,B)2Si8O28(F,Cl)
17.5.51Hellandite-(Y)(Ca,REE)4Y2Al(Be,Li)2-xB4Si4O22(OH)2

Other Names for Dumortierite

Name in Other Languages:

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.

References for Dumortierite

Reference List:
Gonnard, M. F. (1881): Note sur l´existance d´une espèce minérale nouvelle, la dumortiérite dans le gneiss de Beaunan, au-dessus des anciens aqueducs galloromains de la vallée de l´Izeron (Rhône). Bulletin de la Société Minéralogique de France, 4, 2-5.

Damour, M. (1881): Analyse de la dumortiérite. Bulletin de la Société Minéralogique de France, 4, 6-8.

Ford, William Ebenezer (1902): On the chemical composition of dumortierite. Am. Jour. Sci., 4th. Series: 14: 426-430; …Zeitschr. Kristallographie, Band 37: 417-421 (1903).

Schaller, Waldemar Theodore (1905): Dumortierite. Am. Jour. Sci., 4th. Series: 19: 211-224; …USGS Bull. 262: 91-120.

Schaller, Waldemar Theodore (1906): Ueber Dumortierit. Zeitschr. Kristallographie, Band 41: 19-47.

Losert, J. (1956): Dumortierites from the migmatites and pegmatites in the vicinity of Kutná Hora. Rozpr. ČSAV: 66(1): 1-44 (in Czech with Russian and English abstracts).

Hey, M.H. & G.F. Claringbull (1958): New data for dumortierite. Mineralogical Magazine: 31: 901-907.

Neues Jahrbuch für Mineralogie, Abhandlungen: 132: 231-241.

Visser, D. (1995): Bibliography of dumortierite. Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen: Biological, Chemical, Geological, Physical and Medical Sciences 98, 89-105.

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

Cempírek, J. (2003) Mineral assemblages and chemistry of dumortierite from granitic pegmatites. M.S. thesis, Institute of Geological Sciences, Brno, Czech Republic (in Czech with English abstract).

Fuchs, Y., Ertl, A., Hughes, J.M., Prowatke, S., Brandstätter, F., Schuster, R. (2005): Dumortierite from the Gföhl unit, Lower Austria: chemistry, structure, and infra-red spectroscopy. European Journal of Mineralogy, 17, 173-183.

Pieczka, A.; Grew, E.S.; Groat, L.A.; Evans, R.J. (2011): Holtite and dumortierite from the Szklary Pegmatite, Lower Silesia, Poland. Mineralogical Magazine 75, 303-315.

Internet Links for Dumortierite

Localities for Dumortierite

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.
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