petrology of some ejected syenite blocks from $5o Miguel, Azores By J. R. CAN~ Department of Mineralogy and...of Serra de Agua de Pau (Lagoa do Fogo), S~o Miguel, Azores, in an assemblage sanidinearfvedsonite-qua...of Serra de Agua de Pau (Lagoa do Fogo), S~o Miguel, Azores, were first described in the last half of the... and in the present D A L Y I T E FROM T H E AZORES 229 case the identification was confirmed by... and both are marked by the presence of a pyrochlore-group mineral. Both seem to represent slowly cooled
Ce-anomalies (Ce/Ce⁎ 0.4–0.8, mean 0.6), corroded monazite group minerals with LREE-rich patches, and hydrated, Fe-...in Ce by fractional crystallization of cerian pyrochlore, percolated into the subvolcanic system and interacted...after their crystallization. Chevkinite–(Ce), pyrochlore, monazite and synchysite-bastnaesite, occurring...analytical files before the runs. Analyses were Group Samples SiO2-saturated syenites K1–K15, K17–K21...– Nacareniobsite–(Ce) – Chevkinite–(Ce) <0.5 Pyrochlore <0.5 Pyrite – Apatite ≤ 1.0 Monazite <0.5 Xenotime
ideally Na2Ca4YTi(Si2O7)2OF3, is a new rinkite-group (seidozerite-supergroup) TSblock mineral from the... microcline, neptunite, pectolite, calcite, eudialite-group minerals, fluorite, titanite, turkestanite, kupletskite...kupletskite, galena, albite and pyrochlore-group minerals. Crystals are transparent and colourless to occasionally...nonpleochroic. Rinkite-(Y) is monoclinic, space group P21/c, a = 7.3934(5), b = 5.6347(4), c = 18.713(1)...linkage 1 and stereochemistry typical for the rinkite group (Ti = 1 apfu) of the seidozerite supergroup. For
Phoscorite-Carbonatite Complex, NW Russia: III. Pyrochlore Supergroup Minerals Reprinted from: Minerals...in Hainite-(Y) and Batievaite-(Y), Two Rinkite-Group Minerals from the Sakharjok Massif, Keivy Alkaline...rare earths, copper, phosphorus, niobium, platinum-group elements, and other critical metals. The continued...rare earths, copper, phosphorus, niobium, platinum-group elements, and other critical metals. The continuing...[5]. The region is also famous for its platinum-group-element (PGE) deposits, which are investigated by
..............................19 The aragonite group...................................................diamond (native C) crystal structure (cubic, space group Fd3m; a = 3.560 Å; Z = 8) features a framework of...(native C) crystal structure (hexagonal, space group P63/mmc; a = 2.464 Å; c = 6.736 Å; Z = 4) incorporates...(native C) crystal structure (hexagonal, space group P63/mmc; a = 2.52 Å; c = 4.12 Å; Z = 4). [Animation...moissanite (SiC) crystal structure (hexagonal, space group P63mc; a = 3.081 Å; c = 5.031 Å; Z = 2). Carbon
Água de Pau Volcano, São Miguel, Azores, Portugal