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Davreuxite

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Ottré, Vielsalm, Stavelot Massif, Luxembourg Province, Belgium
© JDehove

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Formula:
MnAl
 
6
Si
 
4
O
 
17
(OH)
 
2
System:MonoclinicColour:Creamy-white, pale rose ...
Hardness:2 - 3
This page provides mineralogical data about Davreuxite.

Classification of Davreuxite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/F.33-10
Nickel-Strunz 10th (pending) edition ID:9.BF.15

9 : SILICATES (Germanates)
B : Sorosilicates
F : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in tetrahedral [4] and greater coordination
Dana 8th edition ID: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)
Hey's CIM Ref.:16.16.3

16 : Silicates Containing Aluminum and other Metals
16 : Aluminosilicates of Mn
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Type Occurrence of Davreuxite

Type Locality:Ottré, Vielsalm, Stavelot Massif, Luxembourg Province, Belgium
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°
Maximum Birefringence:δ = 0.030

Chart 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:
MnAl
 
6
Si
 
4
O
 
17
(OH)
 
2
Essential elements:Al, H, Mn, O, Si
All elements listed in formula:Al, H, Mn, O, Si
Common Impurities:Ti,Fe,Cr,Cu,Zn,Mg,P

Relationship of Davreuxite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.BF.05Harstigite
Ca
 
6
(Mn,Mg)Be
 
4
Si
 
6
(O,OH)
 
24
9.BF.10Samfowlerite
Ca
 
28
Mn
 
6
Zn
 
4
(Be,Zn)
 
4
Be
 
12
[(OH)
 
3
|(SiO
 
4
)
 
3
|(Si
 
2
O
 
7
)
 
2
]
 
4
9.BF.20Queitite
Pb
 
4
Zn
 
2
(SO
 
4
)(SiO
 
4
)(Si
 
2
O
 
7
)
Related Minerals - Hey's Index Grouping:

- +
16.16.1Kanonaite
Mn
3+
 
Al(SiO
 
4
)O
16.16.2Spessartine
Mn
2+
3
Al
 
2
(SiO
 
4
)
 
3
16.16.4Sursassite
Mn
2+
2
Al
 
3
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
3
16.16.5Carpholite
Mn
2+
 
Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
16.16.6Kellyite
Mn
2+
2
Al(AlSiO
 
5
)(OH)
 
4
16.16.7Pennantite
Mn
2+
5
Al(AlSi
 
3
O
 
10
)(OH)
 
8
16.16.8Akatoreite
(Mn
2+
 
,Fe
2+
 
)
 
9
Al
 
2
(HSi
 
4
O
 
13
)
 
2
(OH)
 
6
16.16.9Ganophyllite
(K,Na,Ca)
 
2
Mn
 
8
(Si,Al)
 
12
(O,OH)
 
32
 · 8H
 
2
O
16.16.10Mangano-arfvedsonite
[Na][Na
 
2
][Mn
2+
4
(Fe
3+
 
)]Si
 
8
O
 
22
(OH)
 
2
16.16.11Masutomilite
(K,Rb)(Li,Mn
3+
 
,Al)
 
3
(AlSi
 
3
O
 
10
)(F,OH)
 
2
16.16.13Howieite
Na(Fe,Mn)
 
10
(Fe,Al)
 
2
Si
 
12
O
 
31
(OH)
 
13
16.16.14Eggletonite
(Na,K,Ca)
 
2
(Mn,Fe)
 
8
(Si,Al)
 
12
O
 
29
(OH)
 
7
 · 11H
 
2
O
16.16.15Bannisterite
Ca
 
0.5
(K,Na)
 
0.5
(Mn,Fe,Zn)
 
10
(Si,Al)
 
16
O
 
38
(OH)
 
8
 · 5.5H
 
2
O
16.16.16Taneyamalite
(Na,Ca)(Mn,Mg,Fe)
 
12
Si
 
12
(O,OH)
 
44
16.16.17Zussmanite
K(Fe,Mg,Mn)
 
13
(Si,Al)
 
18
O
 
42
(OH)
 
14
16.16.18Coombsite
K(Mn,Fe,Mg)
 
13
(Si,Al)
 
18
O
 
42
(OH)
 
14
16.16.19Henritermierite
Ca
 
3
(Mn
3+
 
,Al)
 
2
(SiO
 
4
)
 
2
(OH)
 
4
16.16.20Macfallite
Ca
 
2
(Mn
3+
 
,Al)
 
3
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
3
16.16.21Ottrélite
(Mn
2+
 
,Fe
2+
 
,Mg)Al
 
2
(SiO
 
4
)O(OH)
 
2
16.16.22Piemontite
{Ca
 
2
}{Al
 
2
Mn
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)
16.16.23Okhotskite
Ca
 
2
(Mn
2+
 
,Mg)(Mn
3+
 
,Al,Fe
3+
 
)
 
2
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
2
 · H
 
2
O
16.16.24Pumpellyite-(Mn2+)
Ca
 
2
(Mn
2+
 
,Mg)(Al,Mn
3+
 
,Fe
3+
 
)
 
2
(Si
 
2
O
 
7
)(SiO
 
4
)(OH)
 
2
 · H
 
2
O
16.16.25Piemontite-(Sr)
{CaSr}{Al
 
2
Mn
3+
 
}(Si
 
2
O
 
7
)(SiO
 
4
)O(OH)

Other Names for Davreuxite

Other Languages:
German:Davreuxit
Russian:Даврексит
Spanish:Davreuxita

Other Information

Health Warning: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

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    • Localities for Davreuxite

    The 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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    (TL) indicates type locality. ? 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
    Label Ex. Coll. H.J. Wilke
          • Cahai (Cahay)
    		No reference listed
    Bull.Acad.roy.Sci.Belg., 2nd ser.(1876) 46, 240-245
    No reference listed
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