Sharyginite, Ca3TiFe2O8, A New Mineral from the Bellerberg Volcano, Germany

Abstract

Abstract:The new mineral sharyginite, Ca 3 TiFe 2 O 8 (P2 1 ma, Z = 2, a = 5.423(2) Å, b = 11.150(8) Å, c = 5.528(2) Å, V = 334.3(3) Å 3 ), a member of the anion deficient perovskite group, was discovered in metacarbonate xenoliths in alkali basalt from the Caspar quarry, Bellerberg volcano, Eifel, Germany. In the holotype specimen, sharyginite is widespread in the contact zone of xenolith with alkali basalt. Sharyginite is associated with fluorellestadite, cuspidine, brownmillerite, rondorfite, larnite and minerals of the chlormayenite-wadalite series. The mineral usually forms flat crystals up to 100 µm in length, which are formed by pinacoids {100}, {010} and {001}. Crystals are flattened on (010). Sharyginite is dark brown, opaque with a brown streak and has a sub-metallic lustre. In reflected light, it is light grey and exhibits rare yellowish-brown internal reflections. The calculated density of sharyginite is 3.943 g·cm -3 . The empirical formula calculated on the basis of 8 O apfu is Ca 3.00 (Fe 3+ octahedra, which are separated by single layers of (Fe 3+ O 4 ) tetrahedra. We suggest that sharyginite formed after perovskite at high-temperature conditions >1000 • C.

Mineralogical Diversity of Ca2SiO4-Bearing Combustion Metamorphic Rocks in the Hatrurim Basin: Implications for Storage and Partitioning of Elements in Oil Shale Clinkering

“…The compositions of numerous perovskite-supergroup minerals from different Hatrurim areas were reported in some previous publications [1,4,[25][26][27][28]32,86,106], and new data on Fe-rich supergroup members are presented in Tables 18-20 and Figure 14. The perovskite-supergroup minerals from the Hatrurim larnite CM rocks contain different amounts of Mn, Mg, Si, Cr, Zr, Nb and REE impurities: perovskite, nataliakulikite and sharyginite/shulamitite are more enriched in Si, Zr, Nb and REE but depleted in Mg relative to brownmillerite/srebrodolskite [25].…”

“…Fe 3+ -rich perovskite-supergroup minerals are widespread main or minor phases in the Hatrurim larnite rocks ( [25][26][27][28]106,115]. They can be classified as layered perovskites according to the material science terminology [116][117][118][119][120] and belong to anion deficient perovskites (brownmillerite subgroup, non-stoichiometric perovskites group) according to the recent nomenclature of the perovskite supergroup [121].…”

Nataliakulikite, Ca4Ti2(Fe3+,Fe2+)(Si,Fe3+,Al)O11, a New Perovskite-Supergroup Mineral from Hatrurim Basin, Negev Desert, Israel

“…No bands have been detected in the 3000-4000 cm −1 region (main for OH vibrations). The Raman spectra for nataliakulikite are interpreted following the results for shulamitite and sharyginite [30,31]. Bands below 400 cm −1 are ascribed to the polyhedral CaO 8 and octahedral (Fe 3+ ,Ti)O 6 vibrations.…”

“…According to the recent nomenclature of the perovskite supergroup [23], it belongs to the anion deficient perovskites (brownmillerite subgroup, non-stoichiometric perovskites group). Brownmillerite Ca 2 Fe 3+ AlO 5 , srebrodolskite Ca 2 Fe 3+ 2 O 5 , shulamitite Ca 3 TiFe 3+ AlO 8 and sharyginite Ca 3 TiFe 3+ 2 O 8 are other members of this subgroup [24][25][26][27][28][29][30][31].…”

Editorial for Special Issue “New Mineral Species and Their Crystal Structures”

“…The next two new minerals, sharyginite, Ca 3 TiFe 2 O 8 (perovskite supegroup member) [4] and nöggerathite-(Ce) (Ce,Ca) 2 Zr 2 (Nb,Ti)(Ti,Nb) 2 Fe 2+ O 14 (zirconolite-related mineral) [5], were discovered in the Eifel region, Rhineland-Palatinate, Germany. Volcanic rocks of Eifel are a unique source of new minerals: more than fifty mineral species were discovered there [6].…”