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Menezesite

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Big Photo

Jacupiranga Mine, Cajati, São Paulo, Brazil
© Vincent Bourgoin

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Formula:
Ba
 
2
MgZr
 
4
(BaNb
 
12
O
 
42
) · 12H
 
2
O
System:IsometricColour:Reddish brown
Hardness:4
Name:
Named for the Brazilian collector and dealer Luiz Alberto Dias Menezes Filho (born 1950), who first found the mineral.


The only natural heteropolyniobate known at present.

Classification of Menezesite

IMA status:Approved 2005
Nickel-Strunz 10th (pending) edition ID:4.FN.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
N : Hydroxides with H2O±(OH); frameworks of corner and/or face-sharing octahedra
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Type Occurrence of Menezesite

Type Locality:Jacupiranga Mine, Cajati, São Paulo, Brazil
General Appearance of Type Material:Rhombododecahedra up to 1 mm, isolated or in aggregates.
Geological Setting of type material:Contact zone between dolomite carbonatite and “jacupirangite” (=a pyroxenite)
Associated Minerals at type locality:
TochiliniteStrontianitePyritePhlogopiteMagnetite
DolomiteClinohumiteCalciteAncylite-(Ce)

Physical Properties of Menezesite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Reddish brown
Streak:White
Hardness (Mohs):4
Density (calculated):4.181 g/cm3

Crystallography of Menezesite

Crystal System:Isometric
Class (H-M):m3 (2/m 3) - Diploidal
Space Group:Im3 {I2/m 3}
Cell Parameters:a = 13.017(1) Å
Unit Cell Volume:V 2,205.63 ų (Calculated from Unit Cell)
Z:2
X-Ray Powder Diffraction:
d-spacingIntensity
9.183 (100)
4.592 (12)
4.136 (11)
3.256 (16)
3.070 (13)
2.923 (11)
2.655 (13)
1.741 (21)

Optical Data of Menezesite

Type:Isotropic
Comments:n>1.93(meas), calculated = 2.034

Chemical Properties of Menezesite

Formula:
Ba
 
2
MgZr
 
4
(BaNb
 
12
O
 
42
) · 12H
 
2
O
Essential elements:Ba, H, Mg, Nb, O, Zr
All elements listed in formula:Ba, H, Mg, Nb, O, Zr

Other Names for Menezesite

Synonyms:
IMA2005-023
Other Languages:
German:Menezesit

Other Information

Fluorescence in UV light:None
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 Menezesite

Reference List:

- +
- Atencio, D. Couthino, J.M.V., Doriguetto, A.C., Mascarenhas, Y.P., Ellena, J.A. & Ferrari, V.C. (2006): Menezesite from Cajati,São Paulo, Brazil: The first heteropolyniobate mineral. 19th General Meeting of the International Mineralogical Association, IMA2006-Kobe, July 23-28, 2006, Programs & Abstracts. 031-06, p. 299

- Daniel Atencio, José M.V. Coutinho, Antonio C. Doriguetto, Yvonne P. Mascarenhas, Javier Ellena, and Viviane Ferrari (2008): Menezesite, the first natural heteropolyniobate, from Cajati, São Paulo, Brazil: Description and crystal structure. American Mineralogist, 93, 81–87.

Internet Links for Menezesite

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    • Localities for Menezesite

    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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    Brazil
     
    • São Paulo
      • Cajati
    		Daniel Atencio, José M.V. Coutinho, Antonio C. Doriguetto, Yvonne P. Mascarenhas, Javier Ellena, and Viviane Ferrari1 (2008): Menezesite, the first natural heteropolyniobate, from Cajati, São Paulo, Brazil: Description and crystal structure. American Mineralogist, 93, 81–87.
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