Hydroxylgugiaite: A new beryllium silicate mineral from the larvik plutonic complex, Southern Norway and the ilímaussaq alkaline complex, South Greenland

the first member of the melilite group to incorporate a hydrogen atom

Joel D. Grice, Roy Kristiansen, Henrik Friis, Ralph Rowe, Mark A. Cooper, Glenn G. Poirier, Panseok Yang, Mark T. Weller

Research output: Contribution to journalArticle

Abstract

Hydroxylgugiaite, ideally (Ca3A1)R4(Si3.5Be2.5)R6O11(OH)3, is a new mineral species from two localities in the Larvik plutonic complex in Porsgrunn, Telemark, Norway, and one locality in Iĺimaussaq, Greenland. Hydroxylgugiaite crystals occur as squat dipyramids {111} (30 × 50 μm) or as elongate tetragonal prisms. The crystals are translucent, white to pale grey in color, with a white streak and vitreous luster. It is brittle, with no apparent cleavage. Hydroxylgugiaite is uniaxial positive with ω = 1.622 ± 0.002 and ϵ = 1.632 ± 0.002. There is no pleochroism and birefringence is low. The average of eight analyses of a single grain of type material (oxide wt.%) gave Na2O 2.04, CaO 32.90, FeO 0.22, MnO 0.74, BeO 13.47 (LA-ICP-MS), Al2O3 0.74, SiO2 44.06, F 1.74, H2O (assuming 3 OH + F) 4.93, Total (-0.73 O = F) 100.10. Potassium, strontium, and magnesium were measured but not detected. The calculated density is 2.79 g cm-3. The empirical formula on the basis of 14 anions including 3 OH- + F- is: (Ca2.76Na0.31Mn0.05Fe0.01)R3.13(Si3.45Be2.53Al0.07)R6.05O11[(OH)2.57F0.43]R3. The formula from crystal-structure analysis of the Saga specimen is: (Ca3.02A0.98)R4(Si1.79Be0.21)R2(Be2.29Si1.71)R4O11(OH)3. Combined structural and chemical data gives the fol lowing formula for the Nakkaalaaq specimen: (Ca2.88A0.98Na0.12Mn0.02)R4(Si1.80Be0.17Al0.03)R2 (Be2.32Si1.68)R4O11[(OH)2.70F0.30]R3; with simplified formula (Ca,A)4(Si,Be)2(Be,Si)4O11(OH)3. The crystal structure of hydroxylgugiaite is tetragonal in acentric space group P421/m, with a 7.4151(2), b 7.4151, c 4.9652(1) Å, V 272.9(1) Å3, and Z=1. It has been refined to an R index of 0.028 on the basis of 342 observed reflections and a correction for the {110} twin law. It is an H-bearing member of the melilite group. The structure has two distinct layers. The one crystallographically distinct Ca site with eight-fold coordination is a square antiprism polyhedron. The Ca polyhedra are in a layer with the H atoms. A second layer consists of corner-sharing Si/Be atoms in tetrahedral coordination with O. One H atom is bonded to an apical O atom that is not shared by two tetrahedra. This H atom is present only when there is a Ca-site vacancy. The other H atom is loosely bonded to the same O atom but at a different site. The IR spectrum supports this H-bonding scheme. Additional hydroxylgugiaite data is given for the other localities.

Original languageEnglish
Pages (from-to)219-232
Number of pages14
JournalCanadian Mineralogist
Volume55
Issue number2
DOIs
Publication statusPublished - 1 Mar 2017

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Beryllium minerals
Silicate minerals
melilite
beryllium
silicate mineral
Hydrogen
hydrogen
crystal structure
Atoms
crystal
pleochroism
birefringence
new mineral
strontium
cleavage
anion
magnesium
potassium
oxide
Bearings (structural)

Keywords

  • Acentric structure
  • Commensurate structure
  • Crystal structure analysis
  • Greenland
  • Hydrogen atoms
  • Melilite group
  • New mineral species
  • Norway
  • Twin

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

Hydroxylgugiaite: A new beryllium silicate mineral from the larvik plutonic complex, Southern Norway and the ilímaussaq alkaline complex, South Greenland : the first member of the melilite group to incorporate a hydrogen atom. / Grice, Joel D.; Kristiansen, Roy; Friis, Henrik; Rowe, Ralph; Cooper, Mark A.; Poirier, Glenn G.; Yang, Panseok; Weller, Mark T.

In: Canadian Mineralogist, Vol. 55, No. 2, 01.03.2017, p. 219-232.

Research output: Contribution to journalArticle

Grice, Joel D. ; Kristiansen, Roy ; Friis, Henrik ; Rowe, Ralph ; Cooper, Mark A. ; Poirier, Glenn G. ; Yang, Panseok ; Weller, Mark T. / Hydroxylgugiaite: A new beryllium silicate mineral from the larvik plutonic complex, Southern Norway and the ilímaussaq alkaline complex, South Greenland : the first member of the melilite group to incorporate a hydrogen atom. In: Canadian Mineralogist. 2017 ; Vol. 55, No. 2. pp. 219-232.
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title = "Hydroxylgugiaite: A new beryllium silicate mineral from the larvik plutonic complex, Southern Norway and the il{\'i}maussaq alkaline complex, South Greenland: the first member of the melilite group to incorporate a hydrogen atom",
abstract = "Hydroxylgugiaite, ideally (Ca3A1)R4(Si3.5Be2.5)R6O11(OH)3, is a new mineral species from two localities in the Larvik plutonic complex in Porsgrunn, Telemark, Norway, and one locality in Iĺimaussaq, Greenland. Hydroxylgugiaite crystals occur as squat dipyramids {111} (30 × 50 μm) or as elongate tetragonal prisms. The crystals are translucent, white to pale grey in color, with a white streak and vitreous luster. It is brittle, with no apparent cleavage. Hydroxylgugiaite is uniaxial positive with ω = 1.622 ± 0.002 and ϵ = 1.632 ± 0.002. There is no pleochroism and birefringence is low. The average of eight analyses of a single grain of type material (oxide wt.{\%}) gave Na2O 2.04, CaO 32.90, FeO 0.22, MnO 0.74, BeO 13.47 (LA-ICP-MS), Al2O3 0.74, SiO2 44.06, F 1.74, H2O (assuming 3 OH + F) 4.93, Total (-0.73 O = F) 100.10. Potassium, strontium, and magnesium were measured but not detected. The calculated density is 2.79 g cm-3. The empirical formula on the basis of 14 anions including 3 OH- + F- is: (Ca2.76Na0.31Mn0.05Fe0.01)R3.13(Si3.45Be2.53Al0.07)R6.05O11[(OH)2.57F0.43]R3. The formula from crystal-structure analysis of the Saga specimen is: (Ca3.02A0.98)R4(Si1.79Be0.21)R2(Be2.29Si1.71)R4O11(OH)3. Combined structural and chemical data gives the fol lowing formula for the Nakkaalaaq specimen: (Ca2.88A0.98Na0.12Mn0.02)R4(Si1.80Be0.17Al0.03)R2 (Be2.32Si1.68)R4O11[(OH)2.70F0.30]R3; with simplified formula (Ca,A)4(Si,Be)2(Be,Si)4O11(OH)3. The crystal structure of hydroxylgugiaite is tetragonal in acentric space group P421/m, with a 7.4151(2), b 7.4151, c 4.9652(1) {\AA}, V 272.9(1) {\AA}3, and Z=1. It has been refined to an R index of 0.028 on the basis of 342 observed reflections and a correction for the {110} twin law. It is an H-bearing member of the melilite group. The structure has two distinct layers. The one crystallographically distinct Ca site with eight-fold coordination is a square antiprism polyhedron. The Ca polyhedra are in a layer with the H atoms. A second layer consists of corner-sharing Si/Be atoms in tetrahedral coordination with O. One H atom is bonded to an apical O atom that is not shared by two tetrahedra. This H atom is present only when there is a Ca-site vacancy. The other H atom is loosely bonded to the same O atom but at a different site. The IR spectrum supports this H-bonding scheme. Additional hydroxylgugiaite data is given for the other localities.",
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TY - JOUR

T1 - Hydroxylgugiaite: A new beryllium silicate mineral from the larvik plutonic complex, Southern Norway and the ilímaussaq alkaline complex, South Greenland

T2 - the first member of the melilite group to incorporate a hydrogen atom

AU - Grice, Joel D.

AU - Kristiansen, Roy

AU - Friis, Henrik

AU - Rowe, Ralph

AU - Cooper, Mark A.

AU - Poirier, Glenn G.

AU - Yang, Panseok

AU - Weller, Mark T.

PY - 2017/3/1

Y1 - 2017/3/1

N2 - Hydroxylgugiaite, ideally (Ca3A1)R4(Si3.5Be2.5)R6O11(OH)3, is a new mineral species from two localities in the Larvik plutonic complex in Porsgrunn, Telemark, Norway, and one locality in Iĺimaussaq, Greenland. Hydroxylgugiaite crystals occur as squat dipyramids {111} (30 × 50 μm) or as elongate tetragonal prisms. The crystals are translucent, white to pale grey in color, with a white streak and vitreous luster. It is brittle, with no apparent cleavage. Hydroxylgugiaite is uniaxial positive with ω = 1.622 ± 0.002 and ϵ = 1.632 ± 0.002. There is no pleochroism and birefringence is low. The average of eight analyses of a single grain of type material (oxide wt.%) gave Na2O 2.04, CaO 32.90, FeO 0.22, MnO 0.74, BeO 13.47 (LA-ICP-MS), Al2O3 0.74, SiO2 44.06, F 1.74, H2O (assuming 3 OH + F) 4.93, Total (-0.73 O = F) 100.10. Potassium, strontium, and magnesium were measured but not detected. The calculated density is 2.79 g cm-3. The empirical formula on the basis of 14 anions including 3 OH- + F- is: (Ca2.76Na0.31Mn0.05Fe0.01)R3.13(Si3.45Be2.53Al0.07)R6.05O11[(OH)2.57F0.43]R3. The formula from crystal-structure analysis of the Saga specimen is: (Ca3.02A0.98)R4(Si1.79Be0.21)R2(Be2.29Si1.71)R4O11(OH)3. Combined structural and chemical data gives the fol lowing formula for the Nakkaalaaq specimen: (Ca2.88A0.98Na0.12Mn0.02)R4(Si1.80Be0.17Al0.03)R2 (Be2.32Si1.68)R4O11[(OH)2.70F0.30]R3; with simplified formula (Ca,A)4(Si,Be)2(Be,Si)4O11(OH)3. The crystal structure of hydroxylgugiaite is tetragonal in acentric space group P421/m, with a 7.4151(2), b 7.4151, c 4.9652(1) Å, V 272.9(1) Å3, and Z=1. It has been refined to an R index of 0.028 on the basis of 342 observed reflections and a correction for the {110} twin law. It is an H-bearing member of the melilite group. The structure has two distinct layers. The one crystallographically distinct Ca site with eight-fold coordination is a square antiprism polyhedron. The Ca polyhedra are in a layer with the H atoms. A second layer consists of corner-sharing Si/Be atoms in tetrahedral coordination with O. One H atom is bonded to an apical O atom that is not shared by two tetrahedra. This H atom is present only when there is a Ca-site vacancy. The other H atom is loosely bonded to the same O atom but at a different site. The IR spectrum supports this H-bonding scheme. Additional hydroxylgugiaite data is given for the other localities.

AB - Hydroxylgugiaite, ideally (Ca3A1)R4(Si3.5Be2.5)R6O11(OH)3, is a new mineral species from two localities in the Larvik plutonic complex in Porsgrunn, Telemark, Norway, and one locality in Iĺimaussaq, Greenland. Hydroxylgugiaite crystals occur as squat dipyramids {111} (30 × 50 μm) or as elongate tetragonal prisms. The crystals are translucent, white to pale grey in color, with a white streak and vitreous luster. It is brittle, with no apparent cleavage. Hydroxylgugiaite is uniaxial positive with ω = 1.622 ± 0.002 and ϵ = 1.632 ± 0.002. There is no pleochroism and birefringence is low. The average of eight analyses of a single grain of type material (oxide wt.%) gave Na2O 2.04, CaO 32.90, FeO 0.22, MnO 0.74, BeO 13.47 (LA-ICP-MS), Al2O3 0.74, SiO2 44.06, F 1.74, H2O (assuming 3 OH + F) 4.93, Total (-0.73 O = F) 100.10. Potassium, strontium, and magnesium were measured but not detected. The calculated density is 2.79 g cm-3. The empirical formula on the basis of 14 anions including 3 OH- + F- is: (Ca2.76Na0.31Mn0.05Fe0.01)R3.13(Si3.45Be2.53Al0.07)R6.05O11[(OH)2.57F0.43]R3. The formula from crystal-structure analysis of the Saga specimen is: (Ca3.02A0.98)R4(Si1.79Be0.21)R2(Be2.29Si1.71)R4O11(OH)3. Combined structural and chemical data gives the fol lowing formula for the Nakkaalaaq specimen: (Ca2.88A0.98Na0.12Mn0.02)R4(Si1.80Be0.17Al0.03)R2 (Be2.32Si1.68)R4O11[(OH)2.70F0.30]R3; with simplified formula (Ca,A)4(Si,Be)2(Be,Si)4O11(OH)3. The crystal structure of hydroxylgugiaite is tetragonal in acentric space group P421/m, with a 7.4151(2), b 7.4151, c 4.9652(1) Å, V 272.9(1) Å3, and Z=1. It has been refined to an R index of 0.028 on the basis of 342 observed reflections and a correction for the {110} twin law. It is an H-bearing member of the melilite group. The structure has two distinct layers. The one crystallographically distinct Ca site with eight-fold coordination is a square antiprism polyhedron. The Ca polyhedra are in a layer with the H atoms. A second layer consists of corner-sharing Si/Be atoms in tetrahedral coordination with O. One H atom is bonded to an apical O atom that is not shared by two tetrahedra. This H atom is present only when there is a Ca-site vacancy. The other H atom is loosely bonded to the same O atom but at a different site. The IR spectrum supports this H-bonding scheme. Additional hydroxylgugiaite data is given for the other localities.

KW - Acentric structure

KW - Commensurate structure

KW - Crystal structure analysis

KW - Greenland

KW - Hydrogen atoms

KW - Melilite group

KW - New mineral species

KW - Norway

KW - Twin

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EP - 232

JO - Canadian Mineralogist

JF - Canadian Mineralogist

SN - 0008-4476

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