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Menezesite

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Luiz Menezes
Formula:
Ba2MgZr4(BaNb12O42) · 12H2O
Colour:
Reddish brown
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
4.181 (Calculated)
Crystal System:
Isometric
Name:
Named in 2006 Daniel Atencio, J. M. V. Couthino, A. C. Doriguetto, Y. P. Mascarenhas, J. A. Ellena, and V. C. Ferrari in honor of the Brazilian mineralogist, mining geologist, and mineral dealer, Luiz Alberto Dias Menezes Filho [1950 Brazil - 2014 Brazil], who first found the mineral in last part of the 1970s, and who contributed widely to the mineralogy of Brazil.
Both menezesite and aspedamite are the only natural heteropolyniobate known at present. Menezesite is somewhat chemically similar to hexaniobates peterandresenite and hansesmarkite. Visually similar to aspedamite and peterandresenite.


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Classification of MenezesiteHide

Approved
Approval Year:
2005
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

Physical Properties of MenezesiteHide

Vitreous
Transparency:
Transparent
Colour:
Reddish brown
Streak:
White
Hardness:
Density:
4.181 g/cm3 (Calculated)

Optical Data of MenezesiteHide

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

Chemical Properties of MenezesiteHide

Formula:
Ba2MgZr4(BaNb12O42) · 12H2O
IMA Formula:
Ba3MgZr4Nb12O42 · 12H2O

Crystallography of MenezesiteHide

Crystal System:
Isometric
Class (H-M):
m3 (2/m 3) - Diploidal
Space Group:
Im3
Cell Parameters:
a = 13.017(1) Å
Unit Cell V:
2,205.63 ų (Calculated from Unit Cell)
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
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)

Type Occurrence of MenezesiteHide

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:

Synonyms of MenezesiteHide

Other Language Names for MenezesiteHide

German:Menezesit

Common AssociatesHide

Associated Minerals Based on Photo Data:
Calcite3 photos of Menezesite associated with Calcite on mindat.org.
Ancylite-(Ce)3 photos of Menezesite associated with Ancylite-(Ce) on mindat.org.
Tochilinite3 photos of Menezesite associated with Tochilinite on mindat.org.
Dolomite2 photos of Menezesite associated with Dolomite on mindat.org.
Phlogopite1 photo of Menezesite associated with Phlogopite on mindat.org.

Fluorescence of MenezesiteHide

Other InformationHide

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 MenezesiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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
Atencio,D., Coutinho, J.M.V., Doriguetto, A.C., Mascarenhas, Y.P., Ellena, J.A. 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 MenezesiteHide

Localities for MenezesiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Brazil (TL)
 
  • 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.
Mineral and/or Locality  
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