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Poços de Caldas alkaline complex, Minas Gerais, Brazil
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Latitude: 21°48'S
Longitude: 46°33'W
 
Name(s) in local language(s): Complexo alcalino de Poços de Caldas
 
Pocos de Caldas complex is one of the largest intrusions of the world (some 800 km²) and extends into the states of Sao Paulo and Minas Gerais. It is a circular structure resembling a collapsed caldera approx. 30 km in diameter. The alkaline complex mainly consists of tinguaite/phonolite, and nepheline syenites, sodalite syenites and various volcanics.
Contains one of the world's largest baddeleyite deposits, bauxite and uranium mining (now abandoned).

Poços de Caldas is also a city and municipality in the microregion of the same name.

Mineral List

Mineral list contains entries from the region specified including sub-localities
Aegirine
Aegirine-augite
Albite
'Allanite'
Alunite
Analcime
Anatase
Ancylite-(Ce)
Ankerite
'Apatite'
Arfvedsonite
Astrophyllite
Augite
var: Soda-Augite

Baddeleyite
Baryte
'Bastnäsite'
Bastnäsite-(Ce)
'Bauxite'
Berthierine
Bílinite
'Biotite'
Birnessite
Brannerite
Burbankite
Calcioancylite-(Ce)
Calcite
'Caldasite'
Cancrinite
Catapleiite
Cerianite-(Ce)
Chamosite
Cheralite
'Chlorite Group'
Coffinite
Crandallite
Cryptomelane
Eudialyte
Ferrihydrite
Ferrokentbrooksite
Fersmanite
Florencite-(Ce)
Fluorapophyllite-(K)
Fluorite
Fluorlamprophyllite (TL)
Gaidonnayite
Georgechaoite
Gibbsite
Goethite
Gonnardite
Gorceixite
Goyazite
Greenockite
Hainite
'Halloysite'
Hematite
Hilairite
Ilmenite
'Ilsemannite'
Jarosite
Jordisite
Kalinite
Kaolinite
Kentbrooksite
'K Feldspar'
Kochite
Kupletskite
Kutnohorite
Lamprophyllite
Lanthanite-(Nd)
Låvenite
Lepidocrocite
Lithiophilite
Lithiophorite
Magnetite
Manganoeudialyte (TL)
Microcline
Microlite Group
Molybdenite
Molybdite
'Monazite'
Monazite-(Ce)
Montmorillonite
Mosandrite
Muscovite
var: Illite

Natrolite
Nepheline
Neptunite
Normandite
Nsutite
Paranatisite
Pectolite
Pentlandite
Phlogopite
Pickeringite
Plumbogummite
Pyrite
Pyrochlore Group
Pyrolusite
Pyrophanite
Pyrophyllite
Quartz
Rinkite
Rosenbuschite
Rutile
Sanidine
Siderite
'Smectite Group'
Sodalite
Sphalerite
Spinel
Strontianite
Tainiolite
Thorbastnäsite
Thorianite
Thorite
Thorogummite
Titanite
Tschermigite
Tuperssuatsiaite
Uraninite
var: Pitchblende
Vermiculite
Villiaumite
Wadeite
Wollastonite
Xenotime-(Y)
Zircon
var: Orvillite


151 entries listed. 112 valid minerals. 2 type localities (valid minerals).

Localities in this Region

Brazil
Brazil

The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

In alphabetical order:

ATENCIO, D. , COUTINHO, J.M.V. & VLACH, S.R.F. (2005). Tuperssuatsiaite from the Bortolan quarry, Poços de Caldas, Minas Gerais, Brazil. Mineralogical Record, 36, 275-280.

ATENCIO, D., COUTINHO, J.M.C., ULBRICH, M.N.C., VLACH, S.R.F., RASTVETAEVA, R.K. & PUSHCHAROVSKY, D.Yu. (1999) Hainite from Poços de Caldas, Minas Gerais, Brazil. Canadian Mineralogist, 37, 91-98.

BAPTISTA, A. (1976) Lamprofilita no lujaurito de Pedra Balão, Poços de Caldas, Minas Gerais. [Lamprophyllite in the lujavrite of Pedra Balão, Poços de Caldas, Minas Gerais.] Annaes da Academia Brasileira de Ciêncas, t. 48, n. 3, 193-196. (in Portugese)

BAPTISTA, A. (1980) Estudio radiocristografico da Eudialita de Pedra Balao, Poços de Caldas, Estado de Minas Gerais. [Radiocrystallographic study of eudialyte from Pedra Balao, Poços de Caldas, Minas Gerais.] Annaes da Academia Brasileira de Ciêncas, 52, (2), 243-250. (in Portugese)

BAPTISTA, A. (1976) Lamprofilita no lujaurito de Pedra Balão, Poços de Caldas, Minas Gerais. [Lamprophyllite in the lujavrite of Pedra Balão, Poços de Caldas, Minas Gerais.] Annaes da Academia Brasileira de Ciêncas, t. 48, n. 3, 193-196. (in Portugese)

BAPTISTA, A. (1980) Estudio radiocristografico da Eudialita de Pedra Balao, Poços de Caldas, Estadode Minas Gerais. Radiocrystallographic study of eudialyte from Pedra Balao, Poços de Caldas, Minas Gerais.] Annaes da Academia Brasileira de Ciêncas, 52, (2), 243-250. (in Portugese)

BARBOSA, O. (1934) Notas sôbre algumas rochas da região de Poços de Caldas. Annaes da Academia Brasileira de Ciêncas, t. 6, n. 4, 211-219. (in Portugese)

BARBOSA, O. (1936) O planalto de Poços de Caldas e suas possibilidades econômicas. Departamento Nacional da Produção Mineral, Divisão de Fomento da Produção Mineral, Av. 8, 19-29. [Rio de Janeiro] (in Portuguese)

BARBOSA, O. (1948) Sôbre a idade das rochas alcalinas e a origem do planalto de Poços de Caldas. Mineração e Metalurgia, 13, 235-236. (in Portuguese)

BARBOSA, R.A. (1979) Sintesa petrographica do planalto de Poços de Caldas. [Petrographic synthesisof the Poços de Caldas Plateau.]. Mineração e Metalurgia, 39, 38 p. (in Portuguese)

DERBY, O.E. (1887) On nepheline rocks in Brazil; with special reference to the association of phonolite and foyaite. Journal of the Geological Society, Quarterly (London) 43, 457-473.

ELLERT, R. (1959) Contribuição à geologia do maciço alcalino de Poços de Caldas. [Contribution to the geology of the Poços de Caldas alkaline massif]. Universidade de Sao Paulo. Faculdade de Filosifia, Ciêncas e Letras, Boletim No.23, Mineralogia, 5-63. (in Portuguese)

ELLERT, R. (1966) The Poços de Caldas alkaline massif. from: Guidebook 1966 International Field Institute, 1-6.

ELLERT, R. (1969) Nota sobre a ocorrencia de villiaumita do maciço de Poços de Caldas, M.G. [The occurrence of villiaumite in the Poços de Caldas massif, M.G.] Mineração e Metalurgia, 49, No. 294, 234. (in Portuguese)

ELLERT, R. (1976) The Poços de Caldas alkaline massif. from: Proceedings of the first International Symposium on Carbonatites, published by: Ministr. Minas e Energia, Brasilia, 305-307.

FRANCO, R.R. and LOEWENSTEIN, W. (1948) Zirconium from the region of Poços de Caldas, American Mineralogist, 33, 142-151.

FRANCO, R.R. (1945) Minerais de zircônio na região de Poços de Caldas, Minas Gerais. [Zirconium minerals from region of Poços de Caldas, Minas Gerais.] Universidade de Sao Paulo.Faculdade de Filosifia, Ciêncas e Letras, Boletim No. 49, Mineralogia, 7, 7-31. (in Portuguese)

FRONDEL, C., and MARVIN, U.B. (1959) Cerianite, CeO2, from Poços de Caldas, Brazil. American Mineralogist, 44, 882-884.

FUJIMORI, K. (1982) Silicato do terras raras (Ce,La,Nd,Ca,Th)SiO4 e cheralita (Th,Ca,Ce,La)(PSiO4). Annaes XXXII Congress Sociedade Brasileira de Geologia, Boletim 2, 669-671. (in Portuguese)

FUJIMORI, K., and SARDELA, I.A. (1980) Estudio mineralogico do "caldasito" dos campos do Serrote, rigida e Tapuari no
Planalto de Poços de Caldas. [Mineralogic study of caldasite in the Serrote, Brigida e Tapuari fields in the Poços de Caldas
Plateau.] Anais XXXI Congresso Sociedade Brasileira de Geologia, 31 (Vol. 4). 2023-2037. (in Portuguese)

GUIMARÃES, D., CAMPOS, M. and FIGUEIREDO, D.G. (1953) Algumas rochas alcalinas de Poços de Caldas relacionadas com as jazidas de caldasito uranifero. Publ. Instituto Pesquisas radioativas, Escola Engenharia Universidade de Minas Gerais, 1953, no.2, 39 p.

LOEWENSTEIN, W. (1952) Estudos sôbre as propriedades quimicas dos minerais de zirconio da regiãode Poços de Caldas, Minas Gerais. [Study of the chemical properties of zirconium minerals of the region of Poços de Caldas, Minas Gerais. Universidade de Sao Paulo,Faculdade de Filosifia, Ciêncas e Letras, Boletim No.147, Mineralogia, 9, 39-74. (in Portuguese) English abstract: Mineralogical Abstracts,
(1953) 53.

MATIOLI, P.A., ATENCIO, D., & COUTINHO, J.M.V. (1994) Barium-free burbankite from Poços de Caldas, Minas Gerais, Brazil. Abstracts with Program, 16th General meeting of the International Mineralogical Association, Pisa, Italy, 268.

MATIOLI, P.A., ATENCIO, D., & TSUGAWA, J.K. (1998) Recent contributions to the mineralogy of Poços de Caldas alkaline massif, Minas Gerais, Brazil. Abstracts with Program, 17th General meeting of the International Mineralogical Association, Toronto, Canada, A111.

SCHORSCHER, H.D., and SHEA, M.E. (1992) The regional geology of the Poços de Caldas alkaline complex: mineralogy and geochemistry of selected nepheline syenites and phonolites. Journal of Geochemical Exploration, 45, 25-51.

SCHUMANN, A. (1993) Changes in mineralogy and geochemistry of a nepheline syenite with increasing bauxitization. Chemical Geology, 107, (3-4) 327-331.

SHEA, M.E. (1992) Isotopic geochemical characterization of selected nepheline syenites and phonolites from the Poços de Caldas alkaline complex, Minas Gerais, Brazil. Journal of Geochemical Exploration, 45, 25-51.

SOUBIÈS, F., MELFI, A., DELVIGNE, J., and SARDELA, I. (1991) Mobilidade do zirconio na bauxitizacao de rochas alcalinas de macico de Poços de Caldas, M.G. [Mobility of zirconium and bauxitification of alkaline rocks of Poços de Caldas, M.G.] Revista Brasileira Geociências, 21, (1) 17-22. (in Portugese)

TEIXEIRA, E.A. (1943) Zircônio em Poços de Caldas, Brazil Departamento Nacional da Produção Mineral, Divisão de Fomento da Produção Mineral, Boletim No. 55, 63 p. (in Portuguese)

TOLBERT, G.E. (1958) Geochemistry of trace element concentrations in the Pocos de Caldas plateau,Brazil. Sociedade Brasileire de Geologia, Boletim 7, (2), 71 79.

TOLBERT, G.E. (1966) The Uraniferous Zirconium Deposits of the Poços de Caldas Plateau, Brazil, U.S. Geological Survey Bulletin 1185-C, 28 p. and maps.

ULBRICH, M.N.C. (1986) K-feldspars from Poços de Caldas nepheline syenites, southern Brazil: chemical, optical and XRD studies. Annaes da Academia Brasileira de Ciêncas, 58, (1). 166.

ULBRICH, M.N.C. (1993) Mineralogy of nepheline syenites from the Poços de Caldas alkaline massif SE Brazil: chemistry, X-ray data and microtextures of feldspars Revista Brasileira de Geociencias, 23, 388-399.

ULBRICH, H.H.G.J. & GOMES, C.B. (1981) Alkaline Rocks from Continental Brazil. Earth Science Reviews, 17, 135-154.

ULBRICH, M.N.C., GOMES, C.B., & ULBRICH, H. (1980) Zonalidade extrema nos piroxenios do nefelina sienito hibrido de Pocos de Caldas - MG. [Extreme zonality in proxenes of the hybrid nepheline syenite of Pocos de Caldas, Minas Gerais.] XXXI congresso brasileiro de geologia; Boletim no. 2, Resumos. XXXI Brazilian geological congress; Bulletin No. 2, Abstracts. 420 (in Portuguese)

ULBRICH, M.N.C., and ULBRICH, H.H.G.J. (1980) Os piroxeniosegirinicos de lujauritos e chibinitos do distribo alcalino de Poços de Caldas. [Aegirine pyroxenes in lujavrite and khibinite in the alkalic district of Poços de Caldas, Minas Gerais.] XXXI Congress Sociedade Brasileira de Geologia, Boletim 1, 93-94. (in Portuguese)

ULBRICH, H.H.G.J., and ULBRICH, M.N.C. (2000) The lujavrite and khibinite bodies in the Poços de Caldas alkaline massif, southeastern Brazil: a structural and petrographic study. Revista Brasileira de Geociencias, 30, 615-622.

WABER, N. (1991) Mineralogy, petrography and geochemistry of the Poços de Caldas analogue study sites, Minas Gerais, Brasil; Morro de Ferro. Universitats Bern, Mineralogisches - Petrographisches Institut, SKB Technical Report, No. 90-12, 110p.

WABER, N. (1992) The supergene thorium and rare-earth deposit at Morro do Ferro, Poços de Caldas, Minas Gerais, Brazil. Journal of Geochemical Exploration, 45, 113-157.

WABER, N., SCHORSCHER, H.D., and PETERS, T. (1992) Hydrothermal and supergene uranium mineralization at the Osamu Utsumi mine, Poços de Caldas, Minas Gerais, Brazil. Journal of Geochemical Exploration, 45, 53-112.

WEDOW, H. (1961) Thorium and rare earths in the Poços de Caldas zirconium district, Brazil. U.S. Geological Survey, Professional Paper 424-D, 214-216.

WEDOW, H. (1961) Laterization of allanite in the Morro do Ferro rare-earth and thorium deposit, Poços de Caldas Plateau, Brazil. Economic Geology, 56, No. 7, 1315.



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