... granite quarry, La Clarté, Perros-Guirec, Ploumanac'h granitic complex, Brittany, France. The empirical formula derived from electron microprobe analysis and single-crystal structure refinement is: A( N a 0.29 K 0.08 ) Σ=0.37 B ( C a 1.69 F e 0.11 2 + M n 0.02 2 + N a 0.18 ) Σ=2.00 C ( F e 1.84 2 + M g...

... Brittany. It is in- truded into the 560 Ma Cadomian granite (Vidal 1976) of Perros-Guirec in the SE, into late Precam- brian gneisses in the E and S , and greywackes in the SW; its western and northern edges are hidden under the sea. The induced metamorphic aureole is c. 1 km wide. Fairly shallow...

... is then discussed. The PPC is located on the northern Brittany coast ( Fig. 1 ). This late-Hercynian granitic epizonal complex is intrusive into (i) the Cadomian Perros-Guirec granite in the South-East and (ii) late Neoproterozoic orthogneisses in the East and South. The PPC is annular and can be subdivided...

... the period 700-500 Ma (Strachan & Roach 1989). Pre-Cadomian basement is exposed in the Channel Islands, at Cap de la Hague and as rafts in the Cadomian Perros-Guirec complex, where it is represented by the 2000-1800 Ma old Icartian gneisses (Fig. 1) (Leutwein et al. 1973; Calvez & Vidal 1978; Auvray et al...

... and the older igid granite of Perros-Guirec. This area shows a secondary foliation roughly parallel to the contact with crystallization of biotite 4- green amphibole, This foliation penetrates the granitic and aplo-pegmatite v ins associ- ated with the coarse-grained granite and is approximately axial planar...

...Ulf Hålenius; Frédéric Hatert; Marco Pasero; Stuart J. Mills IMA No. 2016-116 Ferro-tschermakite □Ca 2 ( Fe 3 2 + Al 2 ) (Si 6 Al 2 )O 22 (OH) 2 Granite quarries, La Clarté, Perros-Guirec, Ploumanac’h Granitic Complex, Bretagne, France (48°48′50″N, 3°28′50″W...

... WILL BE RELEASED BY THE COMMISSION IMA No. 2016-116 Ferro-tschermakite □Ca 2 (Fe 2+ 3 Al 2 )(Si 6 Al 2 )O 22 (OH) 2 Granite quarries, La Clarté, Perros-Guirec, Ploumanac'h Granitic Complex, Bretagne, France (48°48′50″N, 3°28′50″W) IMA No. 2016-117 Protoenstatite Mg 2 Si 2 O 6...

... eclogite sample G201 of rock collection COSEM of the Muséum National d'Histoire Naturelle (MNHN) in Paris, France. This thin section considered as holotype and is also a holotype for closely associated compositionally similar but structurally different mineral lisetite CaNa 2 Al 4 Si 4 O 16 . Other closely...