Pauloabibite, trigonal NaNbO3, isostructural with ilmenite, from the Jacupiranga carbonatite, Cajati, São Paulo, Brazil

Luiz A D Menezes Filho, Daniel Atencio, Marcelo B. Andrade, Robert T Downs, Mário L S C Chaves, Antônio W. Romano, Ricardo Scholz, Aba I C Persiano

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Pauloabibite (IMA 2012-090), trigonal NaNbO3, occurs in the Jacupiranga carbonatite, in Cajati County, São Paulo State, Brazil, associated with dolomite, calcite, magnetite, phlogopite, pyrite, pyrrhotite, ancylite-(Ce), tochilinite, fluorapatite, "pyrochlore", vigezzite, and strontianite. Pauloabibite occurs as encrustations of platy crystals, up to 2 mm in size, partially intergrown with an unidentified Ca-Nb-oxide, embedded in dolomite crystals, which in this zone of the mine can reach centimeter sizes. Cleavage is perfect on {001}. Pauloabibite is transparent and displays a sub-Adamantine luster; it is pinkish brown and the streak is white. The calculated density is 4.246 g/cm3. The mineral is uniaxial; n(mean)calc is 2.078. Chemical composition (n = 17, WDS, wt%) is: Na2O 16.36, MgO 0.04, CaO 1.36, MnO 0.82, FeO 0.11, SrO 0.02, BaO 0.16, SiO2 0.03, TiO2 0.86, Nb2O5 78.66, Ta2O5 0.34, total 98.76. The empirical formula is (Na0.88Ca0.04Mn2+0.02)SΣ0.94(Nb0.98Ti0.02)Σ1.00-O3. X-ray powder-diffraction lines (calculated pattern) [d in Å(I)(hkl)] are: 5.2066(100)(003), 4.4257(82)(101), 3.9730(45)(012), 2.9809(54) (104), 2.3718(88)(21"3), 1.9865(28)(024), 1.8620(53)(21"6), and 1.5383(30)(300). It is trigonal, space group: R3", a = 5.3287(5), c = 15.6197(17) Å, V = 384.10(7) Å3, Z = 6. The crystal structure was solved (R1 = 0.0285, wR2 = 0.0636 for 309 observed reflections). Pauloabibite is isostructural with ilmenite and is polymorphic with isolueshite (cubic) and lueshite (orthorhombic). The name is in honor of Paulo Abib Andery (1922-1976).

Original languageEnglish (US)
Pages (from-to)442-446
Number of pages5
JournalAmerican Mineralogist
Volume100
Issue number2-3
DOIs
StatePublished - Feb 1 2015

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ilmenite
carbonatite
Brazil
dolomite
Wavelength dispersive spectroscopy
crystal
Ferrosoferric Oxide
luster
pyrochlore
encrustation
fluorapatite
Crystals
pyrrhotite
Calcium Carbonate
phlogopite
pyrites
calcite
crystal structure
magnetite
X ray powder diffraction

Keywords

  • Brazil
  • Cajati
  • carbonatite
  • chemical composition
  • crystal structure
  • ilmenite structure
  • Jacupiranga mine
  • new mineral
  • Pauloabibite

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Menezes Filho, L. A. D., Atencio, D., Andrade, M. B., Downs, R. T., Chaves, M. L. S. C., Romano, A. W., ... Persiano, A. I. C. (2015). Pauloabibite, trigonal NaNbO3, isostructural with ilmenite, from the Jacupiranga carbonatite, Cajati, São Paulo, Brazil. American Mineralogist, 100(2-3), 442-446. https://doi.org/10.2138/am-2015-4745

Pauloabibite, trigonal NaNbO3, isostructural with ilmenite, from the Jacupiranga carbonatite, Cajati, São Paulo, Brazil. / Menezes Filho, Luiz A D; Atencio, Daniel; Andrade, Marcelo B.; Downs, Robert T; Chaves, Mário L S C; Romano, Antônio W.; Scholz, Ricardo; Persiano, Aba I C.

In: American Mineralogist, Vol. 100, No. 2-3, 01.02.2015, p. 442-446.

Research output: Contribution to journalArticle

Menezes Filho, LAD, Atencio, D, Andrade, MB, Downs, RT, Chaves, MLSC, Romano, AW, Scholz, R & Persiano, AIC 2015, 'Pauloabibite, trigonal NaNbO3, isostructural with ilmenite, from the Jacupiranga carbonatite, Cajati, São Paulo, Brazil', American Mineralogist, vol. 100, no. 2-3, pp. 442-446. https://doi.org/10.2138/am-2015-4745
Menezes Filho, Luiz A D ; Atencio, Daniel ; Andrade, Marcelo B. ; Downs, Robert T ; Chaves, Mário L S C ; Romano, Antônio W. ; Scholz, Ricardo ; Persiano, Aba I C. / Pauloabibite, trigonal NaNbO3, isostructural with ilmenite, from the Jacupiranga carbonatite, Cajati, São Paulo, Brazil. In: American Mineralogist. 2015 ; Vol. 100, No. 2-3. pp. 442-446.
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abstract = "Pauloabibite (IMA 2012-090), trigonal NaNbO3, occurs in the Jacupiranga carbonatite, in Cajati County, S{\~a}o Paulo State, Brazil, associated with dolomite, calcite, magnetite, phlogopite, pyrite, pyrrhotite, ancylite-(Ce), tochilinite, fluorapatite, {"}pyrochlore{"}, vigezzite, and strontianite. Pauloabibite occurs as encrustations of platy crystals, up to 2 mm in size, partially intergrown with an unidentified Ca-Nb-oxide, embedded in dolomite crystals, which in this zone of the mine can reach centimeter sizes. Cleavage is perfect on {001}. Pauloabibite is transparent and displays a sub-Adamantine luster; it is pinkish brown and the streak is white. The calculated density is 4.246 g/cm3. The mineral is uniaxial; n(mean)calc is 2.078. Chemical composition (n = 17, WDS, wt{\%}) is: Na2O 16.36, MgO 0.04, CaO 1.36, MnO 0.82, FeO 0.11, SrO 0.02, BaO 0.16, SiO2 0.03, TiO2 0.86, Nb2O5 78.66, Ta2O5 0.34, total 98.76. The empirical formula is (Na0.88Ca0.04Mn2+0.02)SΣ0.94(Nb0.98Ti0.02)Σ1.00-O3. X-ray powder-diffraction lines (calculated pattern) [d in {\AA}(I)(hkl)] are: 5.2066(100)(003), 4.4257(82)(101), 3.9730(45)(012), 2.9809(54) (104), 2.3718(88)(21{"}3), 1.9865(28)(024), 1.8620(53)(21{"}6), and 1.5383(30)(300). It is trigonal, space group: R3{"}, a = 5.3287(5), c = 15.6197(17) {\AA}, V = 384.10(7) {\AA}3, Z = 6. The crystal structure was solved (R1 = 0.0285, wR2 = 0.0636 for 309 observed reflections). Pauloabibite is isostructural with ilmenite and is polymorphic with isolueshite (cubic) and lueshite (orthorhombic). The name is in honor of Paulo Abib Andery (1922-1976).",
keywords = "Brazil, Cajati, carbonatite, chemical composition, crystal structure, ilmenite structure, Jacupiranga mine, new mineral, Pauloabibite",
author = "{Menezes Filho}, {Luiz A D} and Daniel Atencio and Andrade, {Marcelo B.} and Downs, {Robert T} and Chaves, {M{\'a}rio L S C} and Romano, {Ant{\^o}nio W.} and Ricardo Scholz and Persiano, {Aba I C}",
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TY - JOUR

T1 - Pauloabibite, trigonal NaNbO3, isostructural with ilmenite, from the Jacupiranga carbonatite, Cajati, São Paulo, Brazil

AU - Menezes Filho, Luiz A D

AU - Atencio, Daniel

AU - Andrade, Marcelo B.

AU - Downs, Robert T

AU - Chaves, Mário L S C

AU - Romano, Antônio W.

AU - Scholz, Ricardo

AU - Persiano, Aba I C

PY - 2015/2/1

Y1 - 2015/2/1

N2 - Pauloabibite (IMA 2012-090), trigonal NaNbO3, occurs in the Jacupiranga carbonatite, in Cajati County, São Paulo State, Brazil, associated with dolomite, calcite, magnetite, phlogopite, pyrite, pyrrhotite, ancylite-(Ce), tochilinite, fluorapatite, "pyrochlore", vigezzite, and strontianite. Pauloabibite occurs as encrustations of platy crystals, up to 2 mm in size, partially intergrown with an unidentified Ca-Nb-oxide, embedded in dolomite crystals, which in this zone of the mine can reach centimeter sizes. Cleavage is perfect on {001}. Pauloabibite is transparent and displays a sub-Adamantine luster; it is pinkish brown and the streak is white. The calculated density is 4.246 g/cm3. The mineral is uniaxial; n(mean)calc is 2.078. Chemical composition (n = 17, WDS, wt%) is: Na2O 16.36, MgO 0.04, CaO 1.36, MnO 0.82, FeO 0.11, SrO 0.02, BaO 0.16, SiO2 0.03, TiO2 0.86, Nb2O5 78.66, Ta2O5 0.34, total 98.76. The empirical formula is (Na0.88Ca0.04Mn2+0.02)SΣ0.94(Nb0.98Ti0.02)Σ1.00-O3. X-ray powder-diffraction lines (calculated pattern) [d in Å(I)(hkl)] are: 5.2066(100)(003), 4.4257(82)(101), 3.9730(45)(012), 2.9809(54) (104), 2.3718(88)(21"3), 1.9865(28)(024), 1.8620(53)(21"6), and 1.5383(30)(300). It is trigonal, space group: R3", a = 5.3287(5), c = 15.6197(17) Å, V = 384.10(7) Å3, Z = 6. The crystal structure was solved (R1 = 0.0285, wR2 = 0.0636 for 309 observed reflections). Pauloabibite is isostructural with ilmenite and is polymorphic with isolueshite (cubic) and lueshite (orthorhombic). The name is in honor of Paulo Abib Andery (1922-1976).

AB - Pauloabibite (IMA 2012-090), trigonal NaNbO3, occurs in the Jacupiranga carbonatite, in Cajati County, São Paulo State, Brazil, associated with dolomite, calcite, magnetite, phlogopite, pyrite, pyrrhotite, ancylite-(Ce), tochilinite, fluorapatite, "pyrochlore", vigezzite, and strontianite. Pauloabibite occurs as encrustations of platy crystals, up to 2 mm in size, partially intergrown with an unidentified Ca-Nb-oxide, embedded in dolomite crystals, which in this zone of the mine can reach centimeter sizes. Cleavage is perfect on {001}. Pauloabibite is transparent and displays a sub-Adamantine luster; it is pinkish brown and the streak is white. The calculated density is 4.246 g/cm3. The mineral is uniaxial; n(mean)calc is 2.078. Chemical composition (n = 17, WDS, wt%) is: Na2O 16.36, MgO 0.04, CaO 1.36, MnO 0.82, FeO 0.11, SrO 0.02, BaO 0.16, SiO2 0.03, TiO2 0.86, Nb2O5 78.66, Ta2O5 0.34, total 98.76. The empirical formula is (Na0.88Ca0.04Mn2+0.02)SΣ0.94(Nb0.98Ti0.02)Σ1.00-O3. X-ray powder-diffraction lines (calculated pattern) [d in Å(I)(hkl)] are: 5.2066(100)(003), 4.4257(82)(101), 3.9730(45)(012), 2.9809(54) (104), 2.3718(88)(21"3), 1.9865(28)(024), 1.8620(53)(21"6), and 1.5383(30)(300). It is trigonal, space group: R3", a = 5.3287(5), c = 15.6197(17) Å, V = 384.10(7) Å3, Z = 6. The crystal structure was solved (R1 = 0.0285, wR2 = 0.0636 for 309 observed reflections). Pauloabibite is isostructural with ilmenite and is polymorphic with isolueshite (cubic) and lueshite (orthorhombic). The name is in honor of Paulo Abib Andery (1922-1976).

KW - Brazil

KW - Cajati

KW - carbonatite

KW - chemical composition

KW - crystal structure

KW - ilmenite structure

KW - Jacupiranga mine

KW - new mineral

KW - Pauloabibite

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