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laachite

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Journal Article

Laachite, (Ca,Mn) 2 Zr 2 Nb 2 TiFeO 14 , a new zirconolite-related mineral from the Eifel volcanic region, Germany

Nikita V. Chukanov, Sergey V. Krivovichev, Anna S. Pakhomova, Igor V. Pekov, Christof Schäfer, Marina F. Vigasina, Konstantin V. Van
Published: 01 March 2014
European Journal of Mineralogy (2014) 26 (1): 103–111.
DOI: https://doi.org/10.1127/0935-1221/2013/0025-2343
...Nikita V. Chukanov; Sergey V. Krivovichev; Anna S. Pakhomova; Igor V. Pekov; Christof Schäfer; Marina F. Vigasina; Konstantin V. Van Abstract The new mineral laachite was discovered in a sanidinite specimen from the Laach Lake (Laacher See) volcano, Eifel region, Rheinland-Pfalz, Germany...
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(a) Cluster of laachite crystals on sanidine. View width is 0.15 mm. Photo: Bernd Gassmann. (b) Twin of laachite on sanidine. View width is 0.5 mm. Photo: Bernd Gassmann.

(a) Cluster of laachite crystals on sanidine. View width is 0.15 mm. Photo:...

Published: 01 March 2014
Fig. 1 (a) Cluster of laachite crystals on sanidine. View width is 0.15 mm. Photo: Bernd Gassmann. (b) Twin of laachite on sanidine. View width is 0.5 mm. Photo: Bernd Gassmann.
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(a) Raman spectrum of laachite obtained with the polarization of the laser beam parallel to the a axis of the crystal. (b) Raman spectrum of laachite obtained with the polarization vector of the laser beam lying in the plane (010), perpendicular to the a axis of the crystal.

(a) Raman spectrum of laachite obtained with the polarization of the laser ...

Published: 01 March 2014
Fig. 2 (a) Raman spectrum of laachite obtained with the polarization of the laser beam parallel to the a axis of the crystal. (b) Raman spectrum of laachite obtained with the polarization vector of the laser beam lying in the plane (010), perpendicular to the a axis of the crystal.
Image
The crystal structure of laachite. Legend as in Fig. 3.

The crystal structure of laachite. Legend as in Fig. 3 .

Published: 01 March 2014
Fig. 4 The crystal structure of laachite. Legend as in Fig. 3 .
Image
Building units of the laachite crystal structure: (a) octahedral layer, (b) layer of seven- and eight-coordinated cations, (c) the module built from the octahedral and heteropolyhedral layers. Legend: Nb1O6 and Nb2O6 octahedra are light grey, TiO6 octahedra are dark grey, Ca1O8 and Ca2O8 polyhedra are light grey with lines, ZrO7 polyhedra are light grey with crosses, Fe atoms are light grey spheres.

Building units of the laachite crystal structure: (a) octahedral layer, (b)...

Published: 01 March 2014
Fig. 3 Building units of the laachite crystal structure: (a) octahedral layer, (b) layer of seven- and eight-coordinated cations, (c) the module built from the octahedral and heteropolyhedral layers. Legend: Nb 1O 6 and Nb 2O 6 octahedra are light grey, Ti O 6 octahedra are dark grey, Ca
Journal Article

Stefanweissite, (Ca, REE ) 2 Zr 2 (Nb,Ti)(Ti,Nb) 2 Fe 2+ O 14 , a new zirconolite-related mineral from the Eifel paleovolcanic region, Germany

Nikita V. Chukanov, Natalia V. Zubkova, Igor V. Pekov, Marina F. Vigasina, Yury S. Polekhovsky, Bernd Ternes, Willi Schüller, Sergey N. Britvin, Dmitry Yu. Pushcharovsky
Published: 21 January 2019
Mineralogical Magazine (2019) 83 (4): 607–614.
DOI: https://doi.org/10.1180/mgm.2018.171
... of Great Britain and Ireland 2019 2019 Mineralogical Society of Great Britain and Ireland stefanweissite new mineral zirconolite laachite nöggerathite-(Ce) sanidinite crystal structure alkaline volcanic rock Laacher See Eifel Thorium, uranium and rare-earth-element ( REE ) minerals...
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View PDF for article title, Stefanweissite, (Ca, REE ) 2 Zr 2 (Nb,Ti)(Ti,Nb) 2 Fe 2+ O 14 , a new zirconolite-related mineral from the Eifel paleovolcanic region, Germany
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Journal Article

Zirconolite from Larvik Plutonic Complex, Norway, its relationship to stefanweissite and nöggerathite, and contribution to the improvement of zirconolite end-member systematics

Jakub Haifler, Radek Škoda, Jan Filip, Alf Olav Larsen, Jan Rohlíček
Published: 01 August 2021
American Mineralogist (2021) 106 (8): 1255–1272.
DOI: https://doi.org/10.2138/am-2021-7510
... 5+ = Nb + Ta, Me 2+ = Fe 2+ + Mg + Mn and Me 3+ = Fe 3+ + Al), which was assumed to be representative of the vast majority of natural zirconolite compositions. Recently, new crystalline analogs of zirconolite-3 O , called laachite–Ca 2 Zr 2 Nb 2 TiFe 2+ O 14 , stefanweissite–(Ca,REE) 2 (Zr...
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View PDF for article title, Zirconolite from Larvik Plutonic Complex, Norway, its relationship to stefanweissite and nöggerathite, and contribution to the improvement of zirconolite end-member systematics
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Compositions of zirconolite from the LPC projected in the ternary plots involving elements assumed to occupy the M[VIII] (a) and M[VI,V,IV] (b) sites, and their comparison with other occurrences worldwide. The Ca vertex represents Ca + [VIII]Mn in the cases of laachite, stefanweissite, nöggerathite, and zirconolite-3T from Laacher See using structural models of Chukanov et al. (2014, 2018, 2019) and Zubkova et al. (2018). (Color online.)

Compositions of zirconolite from the LPC projected in the ternary plots inv...

Published: 01 August 2021
Figure 9. Compositions of zirconolite from the LPC projected in the ternary plots involving elements assumed to occupy the M[VIII] ( a ) and M[VI,V,IV] ( b ) sites, and their comparison with other occurrences worldwide. The Ca vertex represents Ca + [VIII] Mn in the cases of laachite
Journal Article

New Mineral Names,

Dmitriy Belakovskiy, Fernando Cámara, Yulia Uvarova, Olivier C. Gagne
Published: 01 August 2014
American Mineralogist (2014) 99 (8-9): 1806–1813.
DOI: https://doi.org/10.2138/am.2014.650
...Dmitriy Belakovskiy; Fernando Cámara; Yulia Uvarova; Olivier C. Gagne This New Mineral Names has entries for 13 new mineral species, including arsiccioite, bluelizardite, diegogattaite, disulfodadsonite, fabriesite, laachite, oskarssonite, philrothite, putnisite, therasiaite, trinepheline...
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Comparative data for stefanweissite and related minerals. Mineral ...

Published: 21 January 2019
Table 7. Comparative data for stefanweissite and related minerals. Mineral Stefanweissite Nöggerathite-(Ce) Zirconolite-3 O Laachite Idealised formula (Ca, REE ) 2 Zr 2 (Nb,Ti) (Ce,Ca) 2 Zr 2 (Nb,Ti) CaZrTi 2 O 7 Ca 2 Zr 2 Nb 2 TiFeO 14 (Ti,Nb) 2 Fe 2+ O 14 (Ti,Nb) 2
Journal Article

New data on ferriakasakaite-(La) and related minerals extending the compositional field of the epidote supergroup

Nikita V. Chukanov, Natalia V. Zubkova, Christof Schäfer, Dmitry A. Varlamov, vera N. Ermolaeva, Yury S. polekhovsky, Simeon Jančev, Igor V. Pekov, Dmitry Yu. Pushcharovsky
Published: 01 March 2018
European Journal of Mineralogy (2018) 30 (2): 323–332.
DOI: https://doi.org/10.1127/ejm/2018/0030-2716
... are rhodonite, spessartine, tephroite, amphiboles, pyroxenes, mendigite, laachite, and members of the spinel group]. Attempts to find the Mn 2+ analogue of ferriallanite-(La) in this association were unsuccessful until 2016, but at that time the mineral had already been described elsewhere and approved...
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Journal Article

Kingsgateite, ZrMo 6+ 2 O 7 (OH) 2 ⋅2H 2 O, the first natural zirconium molybdate from Kingsgate, New South Wales, Australia

Peter Elliott, Anthony R. Kampf
Published: 27 April 2022
Mineralogical Magazine (2022) 86 (3): 486–491.
DOI: https://doi.org/10.1180/mgm.2022.43
...]. Seven-coordinated Zr sites (pentagonal bipyramids) are found in the structures of several minerals, including baddeleyite, calzirtite, laachite, stefanweissite, voggite and zirconolite. The Mo site is [6]-coordinated by four O 2– atoms, one OH group and one H 2 O group forming a distorted octahedron...
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Journal Article

New minerals and nomenclature modifications approved in 2013

P. A. Williams, F. Hatert, M. Pasero, S. J. Mills
Published: 01 August 2013
Mineralogical Magazine (2013) 77 (6): 2695–2709.
DOI: https://doi.org/10.1180/minmag.2013.077.6.01
... number 4361/1 How to cite: Chukanov, N.V., Krivovichev, S.V., Pakhomova, A.S., Pekov, I.V., Schäfer, C., Vigasina, M.F. and Van, K.V. (2013) Laachite, IMA 2012-100. CNMNC Newsletter No. 16, 2013, page 2700; Mineralogical Magazine , 77 , 2695–2709. IMA No. 2012-101 Adachiite CaFe...
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Journal Article

New Mineral Names ,

Dmitriy I. Belakovskiy, Fernando Cámara, Yulia Uvarova
Published: 01 August 2020
American Mineralogist (2020) 105 (8): 1275–1284.
DOI: https://doi.org/10.2138/am-2020-NMN105819
... to high amounts of REE . The bands corresponding to hydrogen groups and CO 3 2– anions are absent. The Raman spectrum is similar to that of laachite Ca 2 Zr 2 Nb 2 TiFeO 14 in which the bands of ( REE ,Ca)–O- and (Ti,Nb,Zr)–O-stretching vibrations are shifted towards higher and lower values...
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Journal Article

Moxuanxueite, NaCa 6 Zr(Si 2 O 7 ) 2 OF 3 , a new wöhlerite-group mineral from Gejiu alkaline complex, Yunnan Province, China

Kai Qu, Guochen Dong, Ting Li, Guang Fan, Xiangping Gu, Yufei Wang, Yanjuan Wang
Published: 29 January 2025
American Mineralogist (2025)
DOI: https://doi.org/10.2138/am-2024-9397
... syenites of the Sushina Hill Complex, India: implications for the 381 metamorphism of peralkaline syenites. Mineralogical Magazine, 80, 1161 1193. 382 Chukanov, N.V., Krivovichev, S.V., Pakhomova, A.S., Pekov, I.V., Schäfer, C., Vigasina, 383 M.F., and Van, K.V. (2014) Laachite, (Ca, Mn)2Zr2Nb2TiFeO14...
View PDF for article title, Moxuanxueite, NaCa 6 Zr(Si 2 O 7 ) 2 OF 3 , a new wöhlerite-group mineral from Gejiu alkaline complex, Yunnan Province, China
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