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Davreuxite

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Formula:
MnAl6Si4O17(OH)2
System:
Monoclinic
Colour:
Creamy-white, pale rose ...
Hardness:
2 - 3
This page provides mineralogical data about Davreuxite.

Classification of Davreuxite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
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First Recorded Occurrence of Davreuxite

Year of Discovery:
1878

Physical Properties of Davreuxite

Colour:
Creamy-white, pale rose pink
Hardness (Mohs):
2 - 3

Crystallography of Davreuxite

Crystal System:
Monoclinic
Cell Parameters:
a = 9.55Å, b = 5.77Å, c = 12.88Å
β = 116.82°
Ratio:
a:b:c = 1.655 : 1 : 2.232
Unit Cell Volume:
V 633.39 ų (Calculated from Unit Cell)

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
Essential elements:
All elements listed in formula:
Common Impurities:
Ti,Fe,Cr,Cu,Zn,Mg,P

Relationship of Davreuxite to other Species

9.BF.05HarstigiteCa6(Mn,Mg)Be4Si6(O,OH)24
9.BF.10SamfowleriteCa28Mn6Zn4(Be,Zn)4Be12[(OH)3|(SiO4)3|(Si2O7)2]4
9.BF.20QueititePb4Zn2(SO4)(SiO4)(Si2O7)
16.16.1KanonaiteMn3+Al(SiO4)O
16.16.2SpessartineMn32+Al2(SiO4)3
16.16.4SursassiteMn22+Al3(Si2O7)(SiO4)(OH)3
16.16.5CarpholiteMn2+Al2(Si2O6)(OH)4
16.16.6KellyiteMn22+Al(AlSiO5)(OH)4
16.16.7PennantiteMn52+Al(AlSi3O10)(OH)8
16.16.8Akatoreite(Mn2+,Fe2+)9Al2(HSi4O13)2(OH)6
16.16.9Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
16.16.10Mangano-ferri-eckermannite[Na][Na2][Mn42+(Fe3+)]Si8O22(OH)2
16.16.11Masutomilite(K,Rb)(Li,Mn3+,Al)3(AlSi3O10)(F,OH)2
16.16.13HowieiteNa(Fe,Mn)10(Fe,Al)2Si12O31(OH)13
16.16.14Eggletonite(Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7 · 11H2O
16.16.15BannisteriteCa0.5(K,Na)0.5(Mn,Fe,Zn)10(Si,Al)16O38(OH)8 · 5.5H2O
16.16.16Taneyamalite(Na,Ca)(Mn,Mg,Fe)12Si12(O,OH)44
16.16.17ZussmaniteK(Fe,Mg,Mn)13(Si,Al)18O42(OH)14
16.16.18CoombsiteK(Mn,Fe,Mg)13(Si,Al)18O42(OH)14
16.16.19HenritermieriteCa3(Mn3+,Al)2(SiO4)2(OH)4
16.16.20MacfalliteCa2(Mn3+,Al)3(Si2O7)(SiO4)(OH)3
16.16.21Ottrélite(Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2
16.16.22Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
16.16.23OkhotskiteCa2(Mn2+,Mg)(Mn3+,Al,Fe3+)2(Si2O7)(SiO4)(OH)2 · H2O
16.16.24Pumpellyite-(Mn2+)Ca2(Mn2+,Mg)(Al,Mn3+,Fe3+)2(Si2O7)(SiO4)(OH)2 · H2O
16.16.25Piemontite-(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:
Amer.Mineral., 63, 795.
Bull.Acad.Royale Belg.Sér.II (1878) 46, 240-245.
Bull.Soc.Franç.Minéral.Cristallogr. (1886) 9, 4-6.
C.R.Acad.Sci.Paris Sér.D (1976) 295-297.
Amer.Mineral. (1984) 69, 777-782.
Amer.Mineral. (1984) 69, 783-787.
Amer.Mineral. (1984) 69, 1198.

Internet Links for Davreuxite

Localities for Davreuxite

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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