... the development of assemblages belonging to the spurrite–merwinite subfacies of the sanidinite facies. We provide compositional data for spurrite, rustumite, hillebrandite, tilleyite, cuspidine, vesuvianite, monticellite and gehlenite, and the secondary calc-silicates foshagite, dellaite, killalaite, bicchulite...

...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 Abstract The new mineral stefanweissite, IMA2018-020, was discovered in sanidinite volcanic ejecta from the Laach Lake (Laacher...

...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...

... when the blocs landed in the sheet of impact-generated melt. The silica content of the marble led to the formation of a sanidinite-facies assemblage of unusual nesosilicates such as spurrite, merwinite, and monticellite. Aluminian srebrodolskite, Ca 2 (Fe 3+ ,Al) 2 O 5 , is found in material...

... and chemical complexity through billions of years of Earth history. Earth’s first metamorphic minerals formed in thermally altered xenoliths and contact zones (hornfels and sanidinite facies) associated with early Hadean igneous activity (>4.5 Ga). The appearance of new Hadean lithologies, including clay...

... Complex in Israel. The pyrometamorphic rocks of that Complex usually formed in the sanidinite facies (low pressure and high temperature) and, as a rule, under oxidized conditions. This paralava contains nodules and grain aggregates of native Fe, usually distributed linearly in the rock or located close...

..., was discovered in a volcanic ejectum of trachitoid sanidinite collected from the In den Dellen (Zieglowski) pumice quarry, Laach Lake (Laacher See) palaeovolcano, Eifel region, Rhineland-Palatinate, Germany. The associated minerals are sanidine, nepheline, annite and zircon. Bolotinaite occurs as isolated...

... cataclastic metamorphism, and mineralogical phase transformations due to contact metamorphism at temperatures ranging from 1400 to >1710 °C and pressures <0.1 GPa corresponding to sanidinite hornfels facies. Xenolith-based present study provides explicit field and petrological evidences which supports...

...Fig. 1 Crystal of ferriakasakaite-(La) on sanidinite. Laach Lake volcanic complex. Field width 1.2 mm. Photograph: M. Burkhardt. (online version in colour) ...

... sanidinite-facies conditions ( T > 800°C, P <1–2 kbar). Electron microprobe analysis (mean of 9 points) gave in weight% (s.d.): SiO 2 9.57(0.32), TiO 2 0.48(0.27), Al 2 O 3 3.45(1.81), MgO 0.08(0.07), CaO 36.84(0.91), Fe 2 O 3 , Cl 9.60(0.48); O = Cl −2.13, Sum 98.26, and an empirical formula based...

... of dzhuluite ranges from 4.708 to 4.750 g/cm 3 . Raman spectra are analogous to those of kimzeyite, kerimasite and other bitikleite-group minerals. Dzhuluite formed at high temperature during a retrograde stage of primary rock alteration in the larnite subfacies (sanidinite facies) as a result of fluorine...

...} crystal (2 mm in its longest dimension) in a void of a sanidinite xenolith found in the In den Dellen pumice quarries, Niedermendig, Mendig, Laach Lake volcanic complex, Eifel Mountains, Rhineland-Palatinate, Germany. Ferriallanite-(La) is associated with sanidine, minor “biotite”, magnetite, nosean (grey...

... a margin between the veins and the calcio-olivine skarn. The sanidinite facies high-temperature skarn formed ∼500 Ma ago when gabbroid rocks of the Birkhin complex (Baikal area, Eastern Siberia, Russia) intruded and contact-metamorphosed limestone xenoliths. Galuskinite is a retrograde product of skarn...

.... The chegemite forms granular aggregates with grain sizes up to 5 mm and is associated with various high-temperature minerals: larnite, spurrite, rondorfite, reinhardbraunsite, wadalite, lakargiite, and srebrodolskite, corresponding to the sanidinite metamorphic facies. The empirical formula of the holotype...

...)O 3 with strong bands at 352, 437, 446, 554, and 748 cm −1 . Lakargiite crystallized under sanidinite-facies conditions of contact metamorphism characterized by very high temperatures and low pressures. Eight perovskite-group minerals are known to date. There are titanates and niobates...

...Fiorenzo Mazzi; Rosalba Munno Abstract Polymignyte, zirkelite and zirconolite have often been considered the same mineral. Their occurrence, with calciobetafite (a new member of the pyrocjilore group), in a “sanidinite” from Campi Flegrei has allowed their crystal-chemical study and identification...

...F ig . 5. Schematic T (°C)- t plot showing inferred heating rate of xenolith 181 containing the partially reacted cordierite-muscovite intergrowths compared with those of buchite xenoliths in the same eruptive unit of the Wehr volcano, and with sanidinite xenoliths in the Wehr trachyte...