Menezesite
A valid IMA mineral species
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About Menezesite
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.
Type Locality:
The first natural heteropolyniobate to be found. 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.
Unique Identifiers
Mindat ID:
27607
Long-form identifier:
mindat:1:1:27607:0
GUID
(UUID V4):
(UUID V4):
1b276604-440f-48ea-bcdc-55d2960f42e2
IMA Classification of Menezesite
Approved
IMA Formula:
Ba3MgZr4Nb12O42 · 12H2O
Approval year:
2005
First published:
2006
Type description reference:
Classification of Menezesite
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
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
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 |
---|---|---|
Mze | 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 Menezesite
Vitreous
Transparency:
Transparent
Colour:
Reddish brown
Streak:
White
Hardness:
4 on Mohs scale
Density:
4.181 g/cm3 (Calculated)
Optical Data of Menezesite
Type:
Isotropic
Comments:
n>1.93(meas), calculated = 2.034
Chemistry of Menezesite
Mindat Formula:
Ba2MgZr4(BaNb12O42) · 12H2O
Crystallography of Menezesite
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
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) |
---|---|---|---|---|---|---|---|
0004492 | Menezesite | Atencio D, Coutinho J M V, Doriguetto A C, Mascarenhas Y P, Ellena J, Ferrari V C (2008) Menezesite, the first natural heteropolyniobate, from Cajati, Sao Paulo, Brazil: description and crystal structure American Mineralogist 93 81-87 | 2008 | Jacupiranga mine, Cajati county, Sao Paulo, Brazil | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
9.183 Å | (100) |
4.592 Å | (12) |
4.136 Å | (11) |
3.256 Å | (16) |
3.070 Å | (13) |
2.923 Å | (11) |
2.655 Å | (13) |
1.741 Å | (21) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
36 : Carbonatites, kimberlites, and related igneous rocks |
Type Occurrence of Menezesite
General Appearance of Type Material:
Rhombododecahedra up to 1 mm, isolated or in aggregates.
Place of Conservation of Type Material:
The Museu de Geociências,Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562, 05508-080—São Paulo, SP, Brazil, inventory nr.DR458
Empirical Formula of Type Material:
(Ba1.47K0.53Ca0.31Ce0.17Nd0.10Na0.06La0.02)Σ2.66(Mg0.94Mn0.23Fe0.23Al0.03)Σ1.43(Zr2.75Ti0.96Th0.29)Σ4.00[(Ba0.72Th0.26U0.02)Σ1.00(Nb9.23Ti2.29Ta0.36Si0.12)Σ12.00O42]·12H2O
Chemical Analysis of Type Material:
Na2O | 0.06 % |
---|---|
K2O | 0.86 % |
CaO | 0.60 % |
BaO | 11.50 % |
La2O3 | 0.09 % |
Ce2O3 | 0.94 % |
Nd2O3 | 0.57 % |
MgO | 1.29 % |
FeO | 0.57 % |
MnO | 0.55 % |
Al2O3 | 0.05 % |
ZrO2 | 11.58 % |
ThO2 | 4.94 % |
UO2 | 0.23 % |
TiO2 | 8.90 % |
Nb2O5 | 41.97 % |
Ta2O5 | 2.71 % |
SiO2 | 0.25 % |
H2O | 7.40 % |
Total: | 95.06 % |
Geological Setting of Type Material:
Contact zone between dolomite carbonatite and “jacupirangite” (=a pyroxenite)
Associated Minerals at Type Locality:
Reference:
Atencio D, Coutinho J M V, Doriguetto A C, Mascarenhas Y P, Ellena J, Ferrari V C (2008) Menezesite, the first natural heteropolyniobate, from Cajati, São Paulo, Brazil: Description and crystal structure. American Mineralogist 93, 81-87
Synonyms of Menezesite
Other Language Names for Menezesite
German:Menezesit
Common Associates
Associated Minerals Based on Photo Data:
3 photos of Menezesite associated with Calcite | CaCO3 |
3 photos of Menezesite associated with Ancylite-(Ce) | CeSr(CO3)2(OH) · H2O |
3 photos of Menezesite associated with Tochilinite | Fe2+5-6(Mg,Fe2+)5S6(OH)10 |
2 photos of Menezesite associated with Dolomite | CaMg(CO3)2 |
1 photo of Menezesite associated with Phlogopite | KMg3(AlSi3O10)(OH)2 |
Related Minerals - Strunz-mindat Grouping
4.FN. | Aspedamite | ◻ 12(Fe+23Fe2+)Nb4(ThNb9Fe+23 Ti4+O42)(H2O)9(OH)3 |
Fluorescence of Menezesite
None
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 Menezesite
mindat.org URL:
https://www.mindat.org/min-27607.html
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References for Menezesite
Localities for Menezesite
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).
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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Brazil (TL) | |
| Atencio et al. (2008) |
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Jacupiranga mine, Cajati, São Paulo, Brazil