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Davreuxite

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Formula:
Mn2+Al6Si4O17(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)
9.BF.15

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)
16.16.3

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

IMA Formula:
Mn2+Al6Si4O17(OH)2
Elements listed in formula:
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°
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

Relationship of Davreuxite to other Species

9.BF.05HarstigiteCa6Be4Mn2+(SiO4)2(Si2O7)2(OH)2
9.BF.10SamfowleriteCa14Mn32+Zn2Be2Be6Si14O52(OH)6
9.BF.20QueititeZn2Pb4(SiO4)(Si2O7)(SO4)
16.16.1KanonaiteMn3+AlOSiO4
16.16.2SpessartineMn32+Al2(SiO4)3
16.16.4SursassiteMn22+Al3(SiO4)(Si2O7)(OH)3
16.16.5CarpholiteMn2+Al2Si2O6(OH)4
16.16.6Kellyite(Mn2+,Mg,Al)3(Si,Al)2O5(OH)4
16.16.7Pennantite(Mn2+,Al)6(Si,Al)4O10(OH)8
16.16.8AkatoreiteMn92+Al2Si8O24(OH)8
16.16.9Ganophyllite(K,Na)xMn62+(Si,Al)10O24(OH)4 · nH2O (x=1-2; n=7-11)
16.16.10Mangano-ferri-eckermanniteNaNa2(Mn42+Fe3+)Si8O22(OH)2
16.16.11MasutomiliteKLiAlMn2+(Si3Al)O10(F,OH)2
16.16.13HowieiteNa(Fe2+,Fe3+,Al,Mg)12(Si6O17)2(O,OH)10
16.16.14Eggletonite(Na,K,Ca)xMn6(Si,Al)10O24(OH)4 · nH2O, (x = 1-2, n = 7-11)
16.16.15Bannisterite(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2O
16.16.16Taneyamalite(Na,Ca)Mn122+(Si,Al)12(O,OH)44
16.16.17ZussmaniteK(Fe,Mg,Mn)13(Si,Al)18O42(OH)14
16.16.18CoombsiteKMn132+Si18O42(OH)15
16.16.19HenritermieriteCa3Mn23+(SiO4)2(OH)4
16.16.20MacfalliteCa2Mn33+(SiO4)(Si2O7)(OH)3
16.16.21OttréliteMn2+Al2O(SiO4)(OH)2
16.16.22PiemontiteCa2Mn3+Al2(Si2O7)(SiO4)O(OH)
16.16.23OkhotskiteCa2(Mn,Mg)(Mn3+,Al,Fe3+)2Si3(O,OH)14
16.16.24Pumpellyite-(Mn2+)Ca2Mn2+Al2(SiO4)(Si2O7)(OH)2 · H2O
16.16.25Piemontite-(Sr)CaSrMn3+Al2(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.

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 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.
(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
 
  • Liège Province
    • Sankt-Vith
  • Luxembourg Province
    • Stavelot Massif
Michel Bloindieau
H.J. Wilke collection
        • Cahai (Cahay)
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
 
  • Saxony-Anhalt
    • Harz
      • Wippra Metamorphic Zone
Gunnar Farber
Mineral and/or Locality  
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