Davreuxite
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Formula:
MnAl6Si4O17(OH)2
System:
Monoclinic
Colour:
Creamy-white, pale rose ...
Hardness:
2 - 3
Name:
Originally reported and described by de Koninck in 1878. Named after Belgian pharmacist, natural scientist, and Professor of Mineralogy at the University of Liège Charles Joseph Davreux (Liège, Belgium 10th September 1800 - Liège, Belgium 11th April 1863).
This page provides mineralogical data about Davreuxite.
Classification of Davreuxite
Approved, 'Grandfathered' (first described prior to 1959)
8/F.33-10
9.BF.15
9 : SILICATES (Germanates)
B : Sorosilicates
F : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in tetrahedral [4] and greater coordination
9 : SILICATES (Germanates)
B : Sorosilicates
F : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in tetrahedral [4] and greater coordination
58.1.2.1
58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
1 : Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [4] and higher coordination; single and double groups (n=1, 2)
58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
1 : Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [4] and higher coordination; single and double groups (n=1, 2)
16.16.3
16 : Silicates Containing Aluminum and other Metals
16 : Aluminosilicates of Mn
16 : Silicates Containing Aluminum and other Metals
16 : Aluminosilicates of Mn
Physical Properties of Davreuxite
Colour:
Creamy-white, pale rose pink
Hardness (Mohs):
2 - 3
Optical Data of Davreuxite
Type:
Biaxial (-)
RI values:
nα = 1.660 nβ = 1.684 nγ = 1.690
2V:
Measured: 48° , Calculated: 52°
Max Birefringence:
δ = 0.030
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
weak
Chemical Properties of Davreuxite
Formula:
MnAl6Si4O17(OH)2
IMA Formula:
Mn2+Al6Si4O17(OH)2
Common Impurities:
Ti,Fe,Cr,Cu,Zn,Mg,P
Crystallography of Davreuxite
Crystal System:
Monoclinic
Cell Parameters:
a = 9.55 Å, b = 5.77 Å, c = 12.88 Å
β = 116.82°
β = 116.82°
Ratio:
a:b:c = 1.655 : 1 : 2.232
Unit Cell Volume:
V 633.39 ų (Calculated from Unit Cell)
Type Occurrence of Davreuxite
General Appearance of Type Material:
fibrous masses in quartz veins, in close association with pyrophyllite and kaolinite.
Place of Conservation of Type Material:
Royal Belgium Institute of Natural Sciences, Brussels
Mineralogical Museum University of Wroclaw, Poland
Mineralogical Museum University of Wroclaw, Poland
Relationship of Davreuxite to other Species
| 9.BF.05 | Harstigite | Ca6(Mn,Mg)Be4Si6(O,OH)24 |
| 9.BF.10 | Samfowlerite | Ca28Mn6Zn4(Be,Zn)4Be12[(OH)3|(SiO4)3|(Si2O7)2]4 |
| 9.BF.20 | Queitite | Pb4Zn2(SO4)(SiO4)(Si2O7) |
| 16.16.1 | Kanonaite | Mn3+Al(SiO4)O |
| 16.16.2 | Spessartine | Mn32+Al2(SiO4)3 |
| 16.16.4 | Sursassite | Mn22+Al3(SiO4)(Si2O7)(OH)3 |
| 16.16.5 | Carpholite | Mn2+Al2(Si2O6)(OH)4 |
| 16.16.6 | Kellyite | Mn22+Al(AlSiO5)(OH)4 |
| 16.16.7 | Pennantite | Mn52+Al(AlSi3O10)(OH)8 |
| 16.16.8 | Akatoreite | Mn92+Al2Si8O24(OH)8 |
| 16.16.9 | Ganophyllite | (K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O |
| 16.16.10 | Mangano-ferri-eckermannite | [Na][Na2][Mn42+(Fe3+)]Si8O22(OH)2 |
| 16.16.11 | Masutomilite | (K,Rb)(Li,Mn3+,Al)3(AlSi3O10)(F,OH)2 |
| 16.16.13 | Howieite | Na(Fe,Mn)10(Fe,Al)2Si12O31(OH)13 |
| 16.16.14 | Eggletonite | (Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7 · 11H2O |
| 16.16.15 | Bannisterite | (Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O |
| 16.16.16 | Taneyamalite | (Na,Ca)(Mn,Mg,Fe)12Si12(O,OH)44 |
| 16.16.17 | Zussmanite | K(Fe,Mg,Mn)13(Si,Al)18O42(OH)14 |
| 16.16.18 | Coombsite | K(Mn,Fe,Mg)13(Si,Al)18O42(OH)14 |
| 16.16.19 | Henritermierite | Ca3(Mn3+,Al)2(SiO4)2(OH)4 |
| 16.16.20 | Macfallite | Ca2Mn33+(SiO4)(Si2O7)(OH)3 |
| 16.16.21 | Ottrélite | (Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2 |
| 16.16.22 | Piemontite | {Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH) |
| 16.16.23 | Okhotskite | Ca2(Mn,Mg)(Mn3+,Al,Fe3+)2(Si2O7)(SiO4)(OH)2 · H2O |
| 16.16.24 | Pumpellyite-(Mn2+) | Ca2Mn2+Al2(Si2O7)(SiO4)(OH)2 · H2O |
| 16.16.25 | Piemontite-(Sr) | {CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH) |
Other Names for Davreuxite
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 Davreuxite
Reference List:
de Koninck, L. L. (1878): Sur la davreuxite, espèce nouvelle recueillie dans les filons de quartz du terrain ardennais. Bulletin de l'Académie Royale de Belgique, Série II, 46, 240-245.
Bull. Soc. Franç. Minéral. Cristallogr. (1886) 9, 4-6.
Fransolet, A. M. & Bourguignon, P. (1976): Mineralogical data on davreuxite. Comptes Rendus des Seances de l'Académie des Sciences, Série D: Sciences Naturelles 283(4), 295-297 (in French).
Amer. Mineral., 63, 795.
Fransolet, A.M., Abraham, K., Sahl, K. (1984): Davreuxite: a reinvestigation. American Mineralogist 69, 777-782.
Sahl, K., Jones, P.G., Sheldrick, G.M. (1984): The crystal structure of davreuxite, MnAl6Si4O17(OH)2. Am Mineral 69, 783-787.
Amer. Mineral. (1984) 69, 1198.
Van Der Meersche, E., De Paepe, P., and Stoops, G., 2010. Minerals with Belgian Roots, from hopeite (1824) to tazieffite (2009). Academia Press, Gent for the Museum for the History of Sciences, 232 pp.
Bull. Soc. Franç. Minéral. Cristallogr. (1886) 9, 4-6.
Fransolet, A. M. & Bourguignon, P. (1976): Mineralogical data on davreuxite. Comptes Rendus des Seances de l'Académie des Sciences, Série D: Sciences Naturelles 283(4), 295-297 (in French).
Amer. Mineral., 63, 795.
Fransolet, A.M., Abraham, K., Sahl, K. (1984): Davreuxite: a reinvestigation. American Mineralogist 69, 777-782.
Sahl, K., Jones, P.G., Sheldrick, G.M. (1984): The crystal structure of davreuxite, MnAl6Si4O17(OH)2. Am Mineral 69, 783-787.
Amer. Mineral. (1984) 69, 1198.
Van Der Meersche, E., De Paepe, P., and Stoops, G., 2010. Minerals with Belgian Roots, from hopeite (1824) to tazieffite (2009). Academia Press, Gent for the Museum for the History of Sciences, 232 pp.
Internet Links for Davreuxite
mindat.org URL:
https://www.mindat.org/min-1237.html
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Localities for Davreuxite
This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
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(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Belgium | |
| |
| Michel Bloindieau |
| H.J. Wilke collection | |
| Hatert, F., Deliens, M., Fransolet, A.-M. & van der Meersche, E. (2002): Les minéraux de Belgique. 2ème édition, Muséum des Sciences Naturelles, Bruxelles, Ed., 304 p. |
| Bull.Acad.roy.Sci.Belg., 2nd ser.(1876) 46, 240-245 | |
| Hatert, F., Deliens, M., Fransolet, A.-M. & van der Meersche, E. (2002): Les minéraux de Belgique. 2ème édition, Muséum des Sciences Naturelles, Bruxelles, Ed., 304 p. | |
Germany | |
| Gunnar Farber |
Ottré, Vielsalm, Stavelot Massif, Luxembourg Province, Belgium