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Meixnerite

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Prof. Heinz Meixner
Formula:
Mg6Al2(OH)16(OH)2 · 4H2O
System:
Trigonal
Hardness:
2
Name:
Named in honour of Professor Heinrich Hermann Meixner (1908–1981), Austrian mineralogist, University of Salzburg, Salzburg, Austria.
Easily confused with hydrotalcite.

Classification of Meixnerite

Approved
4.FL.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
L : Hydroxides with H2O +- (OH); sheets of edge-sharing octahedra
6.4.6.1

6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
4 : Miscellaneous
7.4.10

7 : Oxides and Hydroxides
4 : Oxides of Be, Mg and the alkaline earths
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http://www.mindat.org/min-2628.html
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First Recorded Occurrence of Meixnerite

Year of Discovery:
1975

Physical Properties of Meixnerite

Hardness (Mohs):
2

Crystallography of Meixnerite

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
R3m
Cell Parameters:
a = 3.046(2) Å, c = 22.93(2) Å
Ratio:
a:c = 1 : 7.528
Unit Cell Volume:
V 184.24 ų (Calculated from Unit Cell)
Comment:
Z = 3/8
X-Ray Powder Diffraction Data:
d-spacingIntensity
7.64 (55)
3.82 (72)
2.57 (64)
2.287 (70)
1.94 (100)
1.52 (75)
1.494 (57)

Optical Data of Meixnerite

Type:
Uniaxial (-)
RI values:
nω = 1.517 nε = 1.500
Max Birefringence:
δ = 0.017
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of Meixnerite

Formula:
Mg6Al2(OH)16(OH)2 · 4H2O
Essential elements:
All elements listed in formula:

Relationship of Meixnerite to other Species

Other Members of Group:
DesautelsiteMg6Mn23+(OH)16[CO3] · 4H2O
DroninoiteNi6Fe32+(OH)16Cl2 · 4H2O
HydrotalciteMg6Al2(OH)16[CO3] · 4H2O
IowaiteMg6Fe23+(OH)16Cl2 · 4H2O
PyroauriteMg6Fe23+(OH)16[CO3] · 4H2O
ReevesiteNi6Fe23+(OH)16(CO3) · 4H2O
StichtiteMg6Cr2(OH)16[CO3] · 4H2O
TakoviteNi6Al2(OH)16[CO3] · 4H2O
WoodalliteMg6Cr2(OH)16Cl2 · 4H2O
4.FL.TrébeurdeniteFe22+Fe43+O2(OH)10CO3·3H2O
4.FL.05WoodalliteMg6Cr2(OH)16Cl2 · 4H2O
4.FL.05IowaiteMg6Fe23+(OH)16Cl2 · 4H2O
4.FL.05Jamborite(Ni2+1-x,Cox3+(OH)2-x(SO4)x·nH2O [x ≤ ⅓; n ≤ (1 - x)]
4.FL.05MuskoxiteMg7Fe4O13 · 10H2O
4.FL.05FougèriteFe42+Fe23+(OH)12[CO3]·3H2O
4.FL.10HydrocalumiteCa4Al2(OH)12(Cl,CO3,OH)2 · 4H2O
4.FL.15KuzeliteCa4Al2(OH)12[SO4] · 6H2O
4.FL.20Aurorite(Mn2+,Ag,Ca)Mn34+O7 · 3H2O
4.FL.20Chalcophanite(Zn,Fe,Mn)Mn3O7 · 3H2O
4.FL.20ErnienickeliteNiMn3O7 · 3H2O
4.FL.20Jianshuiite(Mg,Mn)Mn3O7 · 3H2O
4.FL.25WoodruffiteZn(Mn4+,Mn3+)5O10·3½H2O
4.FL.30Asbolane(Ni,Co)2-xMn4+(O,OH)4 · nH2O
4.FL.35BuseriteNa4Mn14O27 · 21H2O
4.FL.40Ranciéite(Ca,Mn)Mn4O9 · 3H2O
4.FL.40Takanelite(Mn,Ca)Mn4O9 · H2O
4.FL.45Birnessite(Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O
4.FL.55CianciulliiteMn(Mg,Mn)2Zn2(OH)10 · 2-4H2O
4.FL.60JenseniteCu3[TeO6] · 2H2O
4.FL.65LeisingiteCu(Mg,Cu,Fe,Zn)2[TeO6] · 6H2O
4.FL.70Akdalaite4Al2O3 · H2O
4.FL.75Cafetite(Ca,Mg)(Fe,Al)2Ti4O12 · 4H2O
4.FL.80MouriteUMo5O12(OH)10
4.FL.85DeloryiteCu4(UO2)(MoO4)2(OH)6
7.4.1BromelliteBeO
7.4.2BehoiteBe(OH)2
7.4.3ClinobehoiteBe(OH)2
7.4.4ChrysoberylBeAl2O4
7.4.5Magnesiotaaffeite-2N’2SMg3Al8BeO16
7.4.6Magnesiotaaffeite-6N’3SMg2BeAl6O12
7.4.7PericlaseMgO
7.4.8BruciteMg(OH)2
7.4.9SpinelMgAl2O4
7.4.11LimeCaO
7.4.12PortlanditeCa(OH)2
7.4.13ChlormayeniteCa12Al14O32Cl2
7.4.14HydrocalumiteCa4Al2(OH)12(Cl,CO3,OH)2 · 4H2O
7.4.15MarokiteCaMn23+O4
7.4.16Ranciéite(Ca,Mn)Mn4O9 · 3H2O
7.4.17HollanditeBa(Mn64+Mn23+)O16
7.4.18Romanèchite(Ba,H2O)2Mn5O10
7.4.19Todorokite(Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al)6O12 · 3H2O

Other Names for Meixnerite

Name in Other Languages:
German:Meixnerit
Simplified Chinese:羟镁铝石
Spanish:Meixnerita
Traditional Chinese:羥鎂鋁石

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 Meixnerite

Reference List:
Koritnig, S. and P. Süsse (1975) Meixnerite, Mg6Al2(OH)18•4H2O, ein neues Magnesium-Aluminium-Hydroxid-Mineral. Tschermaks Mineral. Petrog. Mitt., 22, 79–87.

American Mineralogist (1976) 61: 176.

Pöllmann, H., Witzke, T. & Dickschas, D. (1998): Meixnerite with the composition [Mg5Al3(OH)16][(OH)3(H2O)4] of Maroldsweisach, Bavaria. Aufschluss 49, 230-232 (in German).

Mills, S.J., Christy, A.G., Genin, J.-M.R., Kameda, T., Colombo, F. (2012): Nomenclature of the hydrotalcite supergroup: natural layered double hydroxides. Mineralogical Magazine, 76, 1289-1336.

Internet Links for Meixnerite

Localities for Meixnerite

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.
Austria
 
  • Lower Austria
    • Waldviertel
      • Nöchling
Tschermaks Min.Petr.Mitt.(1975) 22, 79-87
Germany
 
  • Bavaria
    • Franconia
      • Maroldsweisach
Pöllmann, H., Witzke, T. & Dickschas, D. (1998): Meixnerite with the composition [Mg5Al3(OH)16][(OH)3(H2O)4] of Maroldsweisach, Bavaria. Aufschluss 49, 230-232 (in German).; Wittern: "Mineralfundorte in Deutschland", 2001
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District Mines
        • Sounion area
          • Sounion Mines
Lapis, 24, 7/8 (1999)
Russia
 
  • Eastern-Siberian Region
    • Prebaikalia (Pribaikal'e)
      • Irkutskaya Oblast'
        • Zheleznogorsk
Mazurov, M.P., Grishina, S.N., Istomin, V.E., and Titov, A.T. (2007): Geology of Ore Deposits 49(4), 271-284.
Mineral and/or Locality  
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