Rongibbsite, Pb2(Si4Al)O11(OH), a new zeolitic aluminosilicate mineral with an interrupted framework from Maricopa County, Arizona, U.S.A.

Hexiong Yang, Robert T Downs, Stanley H. Evans, Robert A. Jenkins, Elias M. Bloch

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A new zeolitic aluminosilicate mineral species, rongibbsite, ideally Pb2(Si4Al)O11(OH), has been found in a quartz vein in the Proterozoic gneiss of the Big Horn Mountains, Maricopa County, Arizona, U.S.A. The mineral is of secondary origin and is associated with wickenburgite, fornacite, mimetite, murdochite, and creaseyite. Rongibbsite crystals are bladed (elongated along the c axis, up to 0.70 × 0.20 × 0.05 mm), often in tufts. Dominant forms are {100}, {010}, {001}, and {101̄}. Twinning is common across (100). The mineral is colorless, transparent with white streak and vitreous luster. It is brittle and has a Mohs hardness of ∼5; cleavage is perfect on {100} and no parting was observed. The calculated density is 4.43 g/cm3. Optically, rongibbsite is biaxial (+), with nα = 1.690, nβ = 1.694, nγ = 1.700, cZ = 26°, 2Vmeas = 65(2)°. It is insoluble in water, acetone, or hydrochloric acid. Electron microprobe analysis yielded an empirical formula Pb2.05 (Si 3.89Al1.11)O11 (OH). Rongibbsite is monoclinic, with space group I2/m and unit-cell parameters a = 7.8356(6), b = 13.913(1), c = 10.278(1) Å, β = 92.925(4)°, and V = 1119.0(2) Å3. Its structure features an interrupted framework made of three symmetrically distinct TO4 tetrahedra (T = Si + Al). The framework density is 17.9 T per 1000 Å3. Unlike many known interrupted frameworks in zeolite-type materials, which are usually broken up by OH or F, the framework in rongibbsite is interrupted by O atoms. There are various corner-shared tetrahedral rings in the framework of rongibbsite, including two types of 4-membered, three 6-membered, and one 8-membered rings. The extraframework Pb and OH reside alternately in the channels formed by the 8-membered rings. The Pb cations are disordered over two split sites, Pb and Pb′, with site occupancies of 0.8 and 0.2, respectively, and a Pb-Pb′ distance of 0.229 Å, providing a structural explanation for the two strong Raman bands (at 3527 and 3444 cm-1) attributable to the O-H stretching vibrations. The average bond lengths for the T1, T2, and T3 tetrahedra are 1.620, 1.648, and 1.681 Å, respectively, indicating that the preference of Al for the three tetrahedral sites is T3 ≫ T2 > T1. Rongibbsite represents the first natural aluminosilicate with Pb as the only extraframework cation.

Original languageEnglish (US)
Pages (from-to)236-241
Number of pages6
JournalAmerican Mineralogist
Volume98
Issue number1
DOIs
StatePublished - Jan 2013

Fingerprint

aluminosilicate
Minerals
minerals
tetrahedrons
Cations
rings
mineral
cation
luster
Zeolites
cations
gneiss
acids
Quartz
twinning
Hydrochloric Acid
Twinning
hydrochloric acid
Bond length
Electron probe microanalysis

Keywords

  • Crystal structure
  • Interrupted framework
  • Pb-bearing
  • Raman spectra
  • Rongibbsite
  • X-ray diffraction
  • Zeolitic aluminosilicate

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Rongibbsite, Pb2(Si4Al)O11(OH), a new zeolitic aluminosilicate mineral with an interrupted framework from Maricopa County, Arizona, U.S.A. / Yang, Hexiong; Downs, Robert T; Evans, Stanley H.; Jenkins, Robert A.; Bloch, Elias M.

In: American Mineralogist, Vol. 98, No. 1, 01.2013, p. 236-241.

Research output: Contribution to journalArticle

@article{8da100746fc341a5b037b5bb79bf9eef,
title = "Rongibbsite, Pb2(Si4Al)O11(OH), a new zeolitic aluminosilicate mineral with an interrupted framework from Maricopa County, Arizona, U.S.A.",
abstract = "A new zeolitic aluminosilicate mineral species, rongibbsite, ideally Pb2(Si4Al)O11(OH), has been found in a quartz vein in the Proterozoic gneiss of the Big Horn Mountains, Maricopa County, Arizona, U.S.A. The mineral is of secondary origin and is associated with wickenburgite, fornacite, mimetite, murdochite, and creaseyite. Rongibbsite crystals are bladed (elongated along the c axis, up to 0.70 × 0.20 × 0.05 mm), often in tufts. Dominant forms are {100}, {010}, {001}, and {101̄}. Twinning is common across (100). The mineral is colorless, transparent with white streak and vitreous luster. It is brittle and has a Mohs hardness of ∼5; cleavage is perfect on {100} and no parting was observed. The calculated density is 4.43 g/cm3. Optically, rongibbsite is biaxial (+), with nα = 1.690, nβ = 1.694, nγ = 1.700, cZ = 26°, 2Vmeas = 65(2)°. It is insoluble in water, acetone, or hydrochloric acid. Electron microprobe analysis yielded an empirical formula Pb2.05 (Si 3.89Al1.11)O11 (OH). Rongibbsite is monoclinic, with space group I2/m and unit-cell parameters a = 7.8356(6), b = 13.913(1), c = 10.278(1) {\AA}, β = 92.925(4)°, and V = 1119.0(2) {\AA}3. Its structure features an interrupted framework made of three symmetrically distinct TO4 tetrahedra (T = Si + Al). The framework density is 17.9 T per 1000 {\AA}3. Unlike many known interrupted frameworks in zeolite-type materials, which are usually broken up by OH or F, the framework in rongibbsite is interrupted by O atoms. There are various corner-shared tetrahedral rings in the framework of rongibbsite, including two types of 4-membered, three 6-membered, and one 8-membered rings. The extraframework Pb and OH reside alternately in the channels formed by the 8-membered rings. The Pb cations are disordered over two split sites, Pb and Pb′, with site occupancies of 0.8 and 0.2, respectively, and a Pb-Pb′ distance of 0.229 {\AA}, providing a structural explanation for the two strong Raman bands (at 3527 and 3444 cm-1) attributable to the O-H stretching vibrations. The average bond lengths for the T1, T2, and T3 tetrahedra are 1.620, 1.648, and 1.681 {\AA}, respectively, indicating that the preference of Al for the three tetrahedral sites is T3 ≫ T2 > T1. Rongibbsite represents the first natural aluminosilicate with Pb as the only extraframework cation.",
keywords = "Crystal structure, Interrupted framework, Pb-bearing, Raman spectra, Rongibbsite, X-ray diffraction, Zeolitic aluminosilicate",
author = "Hexiong Yang and Downs, {Robert T} and Evans, {Stanley H.} and Jenkins, {Robert A.} and Bloch, {Elias M.}",
year = "2013",
month = "1",
doi = "10.2138/am.2013.4252",
language = "English (US)",
volume = "98",
pages = "236--241",
journal = "American Mineralogist",
issn = "0003-004X",
publisher = "Mineralogical Society of America",
number = "1",

}

TY - JOUR

T1 - Rongibbsite, Pb2(Si4Al)O11(OH), a new zeolitic aluminosilicate mineral with an interrupted framework from Maricopa County, Arizona, U.S.A.

AU - Yang, Hexiong

AU - Downs, Robert T

AU - Evans, Stanley H.

AU - Jenkins, Robert A.

AU - Bloch, Elias M.

PY - 2013/1

Y1 - 2013/1

N2 - A new zeolitic aluminosilicate mineral species, rongibbsite, ideally Pb2(Si4Al)O11(OH), has been found in a quartz vein in the Proterozoic gneiss of the Big Horn Mountains, Maricopa County, Arizona, U.S.A. The mineral is of secondary origin and is associated with wickenburgite, fornacite, mimetite, murdochite, and creaseyite. Rongibbsite crystals are bladed (elongated along the c axis, up to 0.70 × 0.20 × 0.05 mm), often in tufts. Dominant forms are {100}, {010}, {001}, and {101̄}. Twinning is common across (100). The mineral is colorless, transparent with white streak and vitreous luster. It is brittle and has a Mohs hardness of ∼5; cleavage is perfect on {100} and no parting was observed. The calculated density is 4.43 g/cm3. Optically, rongibbsite is biaxial (+), with nα = 1.690, nβ = 1.694, nγ = 1.700, cZ = 26°, 2Vmeas = 65(2)°. It is insoluble in water, acetone, or hydrochloric acid. Electron microprobe analysis yielded an empirical formula Pb2.05 (Si 3.89Al1.11)O11 (OH). Rongibbsite is monoclinic, with space group I2/m and unit-cell parameters a = 7.8356(6), b = 13.913(1), c = 10.278(1) Å, β = 92.925(4)°, and V = 1119.0(2) Å3. Its structure features an interrupted framework made of three symmetrically distinct TO4 tetrahedra (T = Si + Al). The framework density is 17.9 T per 1000 Å3. Unlike many known interrupted frameworks in zeolite-type materials, which are usually broken up by OH or F, the framework in rongibbsite is interrupted by O atoms. There are various corner-shared tetrahedral rings in the framework of rongibbsite, including two types of 4-membered, three 6-membered, and one 8-membered rings. The extraframework Pb and OH reside alternately in the channels formed by the 8-membered rings. The Pb cations are disordered over two split sites, Pb and Pb′, with site occupancies of 0.8 and 0.2, respectively, and a Pb-Pb′ distance of 0.229 Å, providing a structural explanation for the two strong Raman bands (at 3527 and 3444 cm-1) attributable to the O-H stretching vibrations. The average bond lengths for the T1, T2, and T3 tetrahedra are 1.620, 1.648, and 1.681 Å, respectively, indicating that the preference of Al for the three tetrahedral sites is T3 ≫ T2 > T1. Rongibbsite represents the first natural aluminosilicate with Pb as the only extraframework cation.

AB - A new zeolitic aluminosilicate mineral species, rongibbsite, ideally Pb2(Si4Al)O11(OH), has been found in a quartz vein in the Proterozoic gneiss of the Big Horn Mountains, Maricopa County, Arizona, U.S.A. The mineral is of secondary origin and is associated with wickenburgite, fornacite, mimetite, murdochite, and creaseyite. Rongibbsite crystals are bladed (elongated along the c axis, up to 0.70 × 0.20 × 0.05 mm), often in tufts. Dominant forms are {100}, {010}, {001}, and {101̄}. Twinning is common across (100). The mineral is colorless, transparent with white streak and vitreous luster. It is brittle and has a Mohs hardness of ∼5; cleavage is perfect on {100} and no parting was observed. The calculated density is 4.43 g/cm3. Optically, rongibbsite is biaxial (+), with nα = 1.690, nβ = 1.694, nγ = 1.700, cZ = 26°, 2Vmeas = 65(2)°. It is insoluble in water, acetone, or hydrochloric acid. Electron microprobe analysis yielded an empirical formula Pb2.05 (Si 3.89Al1.11)O11 (OH). Rongibbsite is monoclinic, with space group I2/m and unit-cell parameters a = 7.8356(6), b = 13.913(1), c = 10.278(1) Å, β = 92.925(4)°, and V = 1119.0(2) Å3. Its structure features an interrupted framework made of three symmetrically distinct TO4 tetrahedra (T = Si + Al). The framework density is 17.9 T per 1000 Å3. Unlike many known interrupted frameworks in zeolite-type materials, which are usually broken up by OH or F, the framework in rongibbsite is interrupted by O atoms. There are various corner-shared tetrahedral rings in the framework of rongibbsite, including two types of 4-membered, three 6-membered, and one 8-membered rings. The extraframework Pb and OH reside alternately in the channels formed by the 8-membered rings. The Pb cations are disordered over two split sites, Pb and Pb′, with site occupancies of 0.8 and 0.2, respectively, and a Pb-Pb′ distance of 0.229 Å, providing a structural explanation for the two strong Raman bands (at 3527 and 3444 cm-1) attributable to the O-H stretching vibrations. The average bond lengths for the T1, T2, and T3 tetrahedra are 1.620, 1.648, and 1.681 Å, respectively, indicating that the preference of Al for the three tetrahedral sites is T3 ≫ T2 > T1. Rongibbsite represents the first natural aluminosilicate with Pb as the only extraframework cation.

KW - Crystal structure

KW - Interrupted framework

KW - Pb-bearing

KW - Raman spectra

KW - Rongibbsite

KW - X-ray diffraction

KW - Zeolitic aluminosilicate

UR - http://www.scopus.com/inward/record.url?scp=84872016103&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84872016103&partnerID=8YFLogxK

U2 - 10.2138/am.2013.4252

DO - 10.2138/am.2013.4252

M3 - Article

AN - SCOPUS:84872016103

VL - 98

SP - 236

EP - 241

JO - American Mineralogist

JF - American Mineralogist

SN - 0003-004X

IS - 1

ER -