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Journal Article

Chegemite Ca 7 (SiO 4 ) 3 (OH) 2 – a new humite-group calcium mineral from the Northern Caucasus, Kabardino-Balkaria, Russia

Evgeny V. Galuskin, Viktor M. Gazeev, Biljana Lazic, Thomas Armbruster, Irina O. Galuskina, Aleksander E. Zadov, Nikolai N. Pertsev, Roman Wrzalik, Piotr Dzierżanowski, Anatoly G. Gurbanov, Grażyna Bzowska
Published: 01 October 2009
European Journal of Mineralogy (2009) 21 (5): 1045–1059.
DOI: https://doi.org/10.1127/0935-1221/2009/0021-1962
...Evgeny V. Galuskin; Viktor M. Gazeev; Biljana Lazic; Thomas Armbruster; Irina O. Galuskina; Aleksander E. Zadov; Nikolai N. Pertsev; Roman Wrzalik; Piotr Dzierżanowski; Anatoly G. Gurbanov; Grażyna Bzowska Abstract The new mineral chegemite Ca 7 (SiO 4 ) 3 (OH) 2 ( Pbnm , Z = 4)1, a = 5.0696(1...
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View PDF for article title, <span class="search-highlight">Chegemite</span> Ca 7 (SiO 4 ) 3 (OH) 2 – a new humite-group calcium mineral from the Northern Caucasus, Kabardino-Balkaria, Russia
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Xenolith 1 (A–C): (A) Chegemite with larnite relics and srebrodolskite, lakargiite, spurrite and “Cl-mayenite” inclusions, (B) Chegemite with inclusions of zoned wadalite crystals with external zones of “Cl-mayenite” partially substituted by hydrogarnet, (C) Reinhardbraunsite grains with chegemite inclusions. Xenolith 7 (D–F): (D) Pink chegemite in skarn, (E) Chegemite with rondorfite inclusions and larnite relics, (F) Larnite grain with characteristic twinning replaced by chegemite partially substituted by fluorine reinhardbraunsite. (A–C), (E) BSE images. (F) Transmitted light, crossed nicols. shows field of microprobe analyses points from 12 to 15 in Table 1. 1–17 – microprobe analyses points, see Tables 1–3.

Xenolith 1 (A–C): (A) Chegemite with larnite relics and srebrodolskite, lak...

Published: 01 October 2009
Fig. 2. Xenolith 1 (A–C): (A) Chegemite with larnite relics and srebrodolskite, lakargiite, spurrite and “Cl-mayenite” inclusions, (B) Chegemite with inclusions of zoned wadalite crystals with external zones of “Cl-mayenite” partially substituted by hydrogarnet, (C) Reinhardbraunsite grains
Image
Xenolith 1 (A–C): (A) Chegemite with larnite relics and srebrodolskite, lakargiite, spurrite and “Cl-mayenite” inclusions, (B) Chegemite with inclusions of zoned wadalite crystals with external zones of “Cl-mayenite” partially substituted by hydrogarnet, (C) Reinhardbraunsite grains with chegemite inclusions. Xenolith 7 (D–F): (D) Pink chegemite in skarn, (E) Chegemite with rondorfite inclusions and larnite relics, (F) Larnite grain with characteristic twinning replaced by chegemite partially substituted by fluorine reinhardbraunsite. (A–C), (E) BSE images. (F) Transmitted light, crossed nicols. shows field of microprobe analyses points from 12 to 15 in Table 1. 1–17 – microprobe analyses points, see Tables 1–3.

Xenolith 1 (A–C): (A) Chegemite with larnite relics and srebrodolskite, lak...

Published: 01 October 2009
Fig. 2. Xenolith 1 (A–C): (A) Chegemite with larnite relics and srebrodolskite, lakargiite, spurrite and “Cl-mayenite” inclusions, (B) Chegemite with inclusions of zoned wadalite crystals with external zones of “Cl-mayenite” partially substituted by hydrogarnet, (C) Reinhardbraunsite grains
Image
Backscattered electron images of chlorkyuygenite in altered xenolith of the Upper Chegem Caldera, Northern Caucasus. A Rounded crystal of chlorkyuygenite and their aggregates in chegemite with larnite, fluorellestadite, spurrite and galuskinite inclusions; B relatively big crystals of chlorkyuygenite in chegemite and smaller crystals in srebrodolskite; white rectangle encloses area enlarged in Figure 1 C; C tristetrahedron of chlorkyuygenite; D zonal crystals with wadalite core and chlorkyuygenite rim; E wadalite crystals from calcite-spurrite zone with epitactic growths of chlorkyuygenite; F chlorkyuygenite relics in brucite marble. Chkg - chlorkyuygenite, Chg - chegemite, Lar - larnite, Hcl - hydrocalumite, Spu - spurrite, Gal - galuskinite, Etr - ettringite, Ell - fluorellestadite, Srb - srebrodolskite, Wad - wadalite, Kat - katoite, Rhb - renhardbrausite, Rnd - rondorfite, Cal - calcite, Brc - brucite.

Backscattered electron images of chlorkyuygenite in altered xenolith of the...

Published: 01 January 2015
Fig. 1 Backscattered electron images of chlorkyuygenite in altered xenolith of the Upper Chegem Caldera, Northern Caucasus. A Rounded crystal of chlorkyuygenite and their aggregates in chegemite with larnite, fluorellestadite, spurrite and galuskinite inclusions; B relatively big crystals
Journal Article

Mayenite supergroup, part II: Chlorkyuygenite from Upper Chegem, Northern Caucasus, Kabardino-Balkaria, Russia, a new microporous mineral with “zeolitic” H 2 O

Evgeny V. Galuskin, Irina O. Galuskina, Joachim Kusz, Frank Gfeller, Thomas Armbruster, Radu Bailau, Mateusz Dulski, Viktor M. Gazeev, Nikolai N. Pertsev, Aleksander E. Zadov, Piotr Dzierżanowski
Published: 01 January 2015
European Journal of Mineralogy (2015) 27 (1): 113–122.
DOI: https://doi.org/10.1127/ejm/2015/0027-2419
...Fig. 1 Backscattered electron images of chlorkyuygenite in altered xenolith of the Upper Chegem Caldera, Northern Caucasus. A Rounded crystal of chlorkyuygenite and their aggregates in chegemite with larnite, fluorellestadite, spurrite and galuskinite inclusions; B relatively big crystals...
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View PDF for article title, Mayenite supergroup, part II: Chlorkyuygenite from Upper Chegem, Northern Caucasus, Kabardino-Balkaria, Russia, a new microporous mineral with “zeolitic” H 2 O
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(OH, F) disorder in chegemite displayed with a model using anisotropic atomic displacement parameters (50 % probability) connected by bonds. (a) The structure of chegemite has an inversion centre midway between two adjacent O8 sites relating opposite moieties. In this disorder model, the two H1 sites are too close to each other to allow simultaneous occupancy. The sketches (b) to (d) show local situations of the hydrogen-bond systems contributing to the observed average disorder in (a).

(OH, F) disorder in chegemite displayed with a model using anisotropic atom...

Published: 01 October 2009
Fig. 7. (OH, F) disorder in chegemite displayed with a model using anisotropic atomic displacement parameters (50 % probability) connected by bonds. (a) The structure of chegemite has an inversion centre midway between two adjacent O8 sites relating opposite moieties. In this disorder model
Image
Fig. 7.

Scheme of hydrogen bonds in minerals of the chegemite-fluorchegemite series...

Published: 16 September 2015
F ig . 7. Scheme of hydrogen bonds in minerals of the chegemite-fluorchegemite series.
Image
Backscattered electron images of minerals of edgrewite-hydroxyledgrewite series in altered skarn. (A) Lenticular, atoll-like microstructure resulting from partial replacement of edgrewite by jennite; (B) partial replacement of edgrewite by jennite and subordinate bultfonteinite, which is surrounded by thin mantle of hillebrandite; (C) the largest hydroxyledgrewite crystal, which was used for structure refinement, Raman spectroscopy, and optical studies; (D) hydroxyledgrewite relics in atoll-like pseudomorph associated with reinhardbraunsite and chegemite. Afw = afwillite, Bltf = bultfonteinite, Chg = chegemite-fluorchegemite, Del = dellaite, Egr = edgrewite, Egr-OH = hydroxyledgrewite, Ell = hydroxylellestadite, Jen = jennite, Lar = larnite, Hil = hillebrandite, Rhb = rainhardbraunsite, Trb = trabzonite.

Backscattered electron images of minerals of edgrewite-hydroxyledgrewite se...

Published: 01 November 2012
, which is surrounded by thin mantle of hillebrandite; ( C ) the largest hydroxyledgrewite crystal, which was used for structure refinement, Raman spectroscopy, and optical studies; ( D ) hydroxyledgrewite relics in atoll-like pseudomorph associated with reinhardbraunsite and chegemite. Afw = afwillite
Image
Raman spectra of chlorkyuygenite obtained at different temperatures. At the bottom of figure the chegemite spectrum is shown, bands of which are observed in chlorkyuygenite spectra (stars).

Raman spectra of chlorkyuygenite obtained at different temperatures. At the...

Published: 01 January 2015
Fig. 5 Raman spectra of chlorkyuygenite obtained at different temperatures. At the bottom of figure the chegemite spectrum is shown, bands of which are observed in chlorkyuygenite spectra (stars).
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FTIR spectrum of chegemite from xenolith 7 determined by the standard method (KBr pellet) in the regions: (a) 1100–400 cm−1, (b) 3600–3400 cm−1.

FTIR spectrum of chegemite from xenolith 7 determined by the standard metho...

Published: 01 October 2009
Fig. 4. FTIR spectrum of chegemite from xenolith 7 determined by the standard method (KBr pellet) in the regions: (a) 1100–400 cm −1 , (b) 3600–3400 cm −1 .
Image
FTIR reflection spectrum, transformed by the Kramers-Krönig method, measured for a chegemite grain from xenolith 1 in the regions: (a) 1100–700 cm−1, (b) 3650–3400 cm−1.

FTIR reflection spectrum, transformed by the Kramers-Krönig method, measur...

Published: 01 October 2009
Fig. 3. FTIR reflection spectrum, transformed by the Kramers-Krönig method, measured for a chegemite grain from xenolith 1 in the regions: (a) 1100–700 cm −1 , (b) 3650–3400 cm −1 .
Image
Raman spectra of chegemite (1 – separated grain, 2 – grain in thin-section) and reinhardbraunsite (3 – separated grain) in the regions: (a) 1200–200 cm−1, (b) 3700–3300 cm−1.

Raman spectra of chegemite (1 – separated grain, 2 – grain in thin-section)...

Published: 01 October 2009
Fig. 5. Raman spectra of chegemite (1 – separated grain, 2 – grain in thin-section) and reinhardbraunsite (3 – separated grain) in the regions: (a) 1200–200 cm −1 , (b) 3700–3300 cm −1 .
Image
Fig. 5.

Raman spectra of fluorchegemite (1) and chegemite (2) from the Upper Chegem...

Published: 16 September 2015
F ig . 5. Raman spectra of fluorchegemite (1) and chegemite (2) from the Upper Chegem Caldera and fluorchegemite (3) from the Shadil-Khokh volcano. (A) 1200–200 cm −1 region, (B) 3700–3000 cm −1 region.
Journal Article

New Mineral Names

Glenn Poirier, Kimberly T. Tait, Paula C. Piilonen
Published: 01 July 2010
American Mineralogist (2010) 95 (7): 1121–1124.
DOI: https://doi.org/10.2138/am.2010.564
... ). The strongest eight reflections of the X-ray powder diffraction pattern [ d obs in Å( I obs , hkl )] are: 9.095(100,001), 6.279(42,1̅11,110), 4.189(32,1̅22,121), 3.972(76,1̅41,140), 3.205(37,1̅13,112), 2.964(70,2̅32,230), 2.915(92,1̅33,132), 2.757(33,2̅42,240). The new mineral chegemite Ca 7 (SiO 4 ) 3...
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[100] projection of the polyhedral structure model of chegemite. Four symmetry independent CaO6 octahedra are labelled M1 to M4. SiO4 tetrahedra are black with light grey outlines. (OH, F) sites are indicated by black circles with white rims. The structure consists of two staggered olivine-like slabs separated by a boundary (along [010]) with (OH, F).

[100] projection of the polyhedral structure model of chegemite. Four symme...

Published: 01 October 2009
Fig. 6. [100] projection of the polyhedral structure model of chegemite. Four symmetry independent CaO 6 octahedra are labelled M1 to M4. SiO 4 tetrahedra are black with light grey outlines. (OH, F) sites are indicated by black circles with white rims. The structure consists of two staggered
Journal Article

FLUORCHEGEMITE, Ca 7 (SiO 4 ) 3 F 2 , A NEW MINERAL FROM THE EDGREWITE-BEARING ENDOSKARN ZONE OF AN ALTERED XENOLITH IN IGNIMBRITES FROM UPPER CHEGEM CALDERA, NORTHERN CAUCASUS, KABARDINO-BALKARIA, RUSSIA: OCCURRENCE, CRYSTAL STRUCTURE, AND NEW DATA ON THE MINERAL ASSEMBLAGES

Irina O. Galuskina, Biljana Krüger, Evgeny V. Galuskin, Thomas Armbruster, Viktor M. Gazeev, Roman Włodyka, Mateusz Dulski, Piotr Dzierżanowski
Published: 16 September 2015
The Canadian Mineralogist (2015) 53 (2): 325–344.
DOI: https://doi.org/10.3749/canmin.1400084
...F ig . 7. Scheme of hydrogen bonds in minerals of the chegemite-fluorchegemite series. ...
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View PDF for article title, FLUORCHEGEMITE, Ca 7 (SiO 4 ) 3 F 2 , A NEW MINERAL FROM THE EDGREWITE-BEARING ENDOSKARN ZONE OF AN ALTERED XENOLITH IN IGNIMBRITES FROM UPPER CHEGEM CALDERA, NORTHERN CAUCASUS, KABARDINO-BALKARIA, RUSSIA: OCCURRENCE, CRYSTAL STRUCTURE, AND NEW DATA ON THE MINERAL ASSEMBLAGES
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Journal Article

Eltyubyuite, Ca 12 Fe 3+ 10 Si 4 O 32 Cl 6 – the Fe 3+ analogue of wadalite: a new mineral from the Northern Caucasus, Kabardino-Balkaria, Russia

Evgeny V. Galuskin, Irina O. Galuskina, Radu Bailau, Krystian Prusik, Viktor M. Gazeev, Aleksandr E. Zadov, Nikolai N. Pertsev, Lidia Jeżak, Anatoly G. Gurbanov, Leonid Dubrovinsky
Published: 01 May 2013
European Journal of Mineralogy (2013) 25 (2): 221–229.
DOI: https://doi.org/10.1127/0935-1221/2013/0025-2285
... or larnite grains and commonly overgrows wadalite. Associated minerals are hydroxylellestadite, edgrewite-hydroxyledgrewite, chegemite-fluorchegemite, cuspidine, lakargiite, perovskite, kerimasite, srebrodolskite and dovyrenite. Eltyubyuite formed by contact metamorphism of calcareous sediments under...
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Journal Article

Edgrewite Ca 9 (SiO 4 ) 4 F 2 -hydroxyledgrewite Ca 9 (SiO 4 ) 4 (OH) 2 , a new series of calcium humite-group minerals from altered xenoliths in the ignimbrite of Upper Chegem caldera, Northern Caucasus, Kabardino-Balkaria, Russia

Evgeny V. Galuskin, Biljana Lazic, Thomas Armbruster, Irina O. Galuskina, Nikolai N. Pertsev, Viktor M. Gazeev, Roman Włodyka, Mateusz Dulski, Piotr Dzierżanowski, Aleksandr E. Zadov, Leonid S. Dubrovinsky
Published: 01 November 2012
American Mineralogist (2012) 97 (11-12): 1998–2006.
DOI: https://doi.org/10.2138/am.2012.4161
..., which is surrounded by thin mantle of hillebrandite; ( C ) the largest hydroxyledgrewite crystal, which was used for structure refinement, Raman spectroscopy, and optical studies; ( D ) hydroxyledgrewite relics in atoll-like pseudomorph associated with reinhardbraunsite and chegemite. Afw = afwillite...
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View PDF for article title, Edgrewite Ca 9 (SiO 4 ) 4 F 2 -hydroxyledgrewite Ca 9 (SiO 4 ) 4 (OH) 2 , a new series of calcium humite-group minerals from altered xenoliths in the ignimbrite of Upper Chegem caldera, Northern Caucasus, Kabardino-Balkaria, Russia
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Journal Article

Vorlanite (CaU 6+ )O 4 —A new mineral from the Upper Chegem caldera, Kabardino-Balkaria, Northern Caucasus, Russia

Evgeny V. Galuskin, Thomas Armbruster, Irina O. Galuskina, Biljana Lazic, Antoni Winiarski, Viktor M. Gazeev, Piotr Dzierżanowski, Aleksandr E. Zadov, Nikolai N. Pertsev, Roman Wrzalik, Anatoly G. Gurbanov, Janusz Janeczek
Published: 01 January 2011
American Mineralogist (2011) 96 (1): 188–196.
DOI: https://doi.org/10.2138/am.2011.3610
... over a single site with average M-O = 2.33 Å. Vorlanite is believed to be a pseudomorphic replacement of originally rhombohedral CaUO 4 . We assume that this rhombohedral phase transformed by radiation damage to cubic CaUO 4 (vorlanite). The new mineral is associated with larnite, chegemite...
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View PDF for article title, Vorlanite (CaU 6+ )O 4 —A new mineral from the Upper Chegem caldera, Kabardino-Balkaria, Northern Caucasus, Russia
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Megawite and lakargiite in skarns of the Upper Chegem caldera: (a–c) spurrite skarns from xenolith no. 1; (a) megawite crystals are found only inside spurrite grains (magnified fragment is shown in inset), whereas lakargiite is widespread in both spurrite and wadalite-hydrocalumite-calcite aggregate; (b) spurrite crystal etched in 10% HCl with megawite and wadalite inclusions (a magnified image of a megawite crystal is shown in inset); (c) megawite and lakargiite in a fractured spurrite crystal (see description in the text); (d) pseudo-cubic crystals of high-Sn lakargiite overgrowing a porous aggregate of lakargiite and srebrodolskite from the chegemite zone of xenolith no. 7; (e) crystals of high-Sn lakargiite with external zones of megawite growing over a fine-grained lakargiite-wadalite-hibschite aggregate, burtite CaSn(OH)6 also occurs in this association; (f) megawite and garnet forming later zones in complex pseudomorphs after zircon, from the larnite-cuspidine zone of xenolith no. 3 (a zoned crystal comprising a lakargiite core and a megawite rim is shown inset). Arabic numerals show the sites of the EMPA analyses. Abbreviations are: Meg, megawite; Afw, afwillite; Brc, brucite; Brt, burtite; Cal, calcite; Chg, chegemite; Etr, ettringite; Hgr, hydrogrossular; Hil, hillebrandite; Hcl, hydrocalumite; Lak, lakargiite; Lar, larnite; Rnd, rondorfite; Sch, schorlomite; Spu, spurrite; Srb, srebrodolskite; Tot, toturite; Wad, wadalite.

Megawite and lakargiite in skarns of the Upper Chegem caldera: ( a – c ) sp...

Published: 01 October 2011
lakargiite overgrowing a porous aggregate of lakargiite and srebrodolskite from the chegemite zone of xenolith no. 7; ( e ) crystals of high-Sn lakargiite with external zones of megawite growing over a fine-grained lakargiite-wadalite-hibschite aggregate, burtite CaSn(OH) 6 also occurs in this association