Davreuxite
A valid IMA mineral species - grandfathered
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About Davreuxite
Formula:
MnAl6Si4O17(OH)2
Colour:
Creamy-white, pale rose pink
Hardness:
2 - 3
Specific Gravity:
3.30 - 3.38
Crystal System:
Monoclinic
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).
Type Locality:
This page provides mineralogical data about Davreuxite.
Unique Identifiers
Mindat ID:
1237
Long-form identifier:
mindat:1:1:1237:5
GUID
(UUID V4):
(UUID V4):
f0cfe9cb-d454-44b2-b68e-d9f7f25bcb15
IMA Classification of Davreuxite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Mn2+Al6Si4O17(OH)2
Classification of Davreuxite
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
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Drx | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Davreuxite
Transparency:
Transparent, Translucent
Colour:
Creamy-white, pale rose pink
Hardness:
2 - 3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
Good on {100}.
Good on {100}.
Comment:
Cross fractures on {010}.
Density:
3.30 - 3.38 g/cm3 (Measured) 3.34 g/cm3 (Calculated)
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.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
weak
Chemistry of Davreuxite
Mindat Formula:
MnAl6Si4O17(OH)2
Common Impurities:
Ti,Fe,Cr,Cu,Zn,Mg,P
Crystallography of Davreuxite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
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 V:
633.39 ų (Calculated from Unit Cell)
Z:
2
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0000955 | Davreuxite | Sahl K, Jones P G, Sheldrick G M (1984) The crystal structure of davreuxite, MnAl6Si4O17(OH)2 American Mineralogist 69 783-787 |  | 1984 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.511 Å | (100) |
| 2.870 Å | (60) |
| 3.103 Å | (45) |
| 4.290 Å | (40) |
| 5.719 Å | (35) |
| 2.840 Å | (35) |
| 8.51 Å | (30) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 5: Initiation of plate tectonics | <3.5-2.5 |
| 40 : Regional metamorphism (greenschist, amphibolite, granulite facies) |
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
Associated Minerals at Type Locality:
Reference:
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(8), 240-245.
Other Language Names for Davreuxite
Common Associates
Related Minerals - Strunz-mindat Grouping
| 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) |
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.
Internet Links for Davreuxite
mindat.org URL:
https://www.mindat.org/min-1237.html
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Please feel free to link to this page.
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References for Davreuxite
Reference List:
Localities for Davreuxite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Belgium | |
| Fransolet et al. (1984) +1 other reference |
| Michel Blondieau. +2 other references |
| H.J. Wilke collection | |
| de Koninck (1878) +7 other references | |
| Corin (1929) +2 other references | |
| Hatert et al. (2002) |
| Hatert et al. (2002) | |
| Blondieau (2005) | |
Germany | |
| Färber (n.d.) |
Quick NavTopAbout DavreuxiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence Other LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Ottré, Bihain, Vielsalm, Luxembourg, Wallonia, Belgium