PETROLOGICAL ABSTRACTS AND REVIEWS 495 



Lacroix, a. "Les roches basiques non volcaniques de Madagas- 

 car," Comptes Rendus, CLIX (1914), 417-21. 



Anahohitsite is a new name given to a "pyroxenite" with olivine, hypers- 

 thene, hornblende, and 30 per cent ilmenite and magnetite. It forms the 

 periphery of the gabbro massif in Anabohitsy. The amount of olivine is not 

 stated. Why not a peridotite ? An analysis is given. 



Lacroix, A. "Sur un type nouveau de roche granitique alcaline, 

 renfermant une eucolite," Comptes Rendus, CLX (19 15), 



253-57- 

 A rock composed of much quartz, alcalic feldspar (microperthitic soda- 

 orthoclase or anorthoclase with albite, in other cases albite alone), aegirite, 

 riebeckite, and eucolite, occurring either fine-, medium-, or coarse-grained, is 

 given the name fasibiiikite. It is compared with rockallite. A chemical but 

 no modal analysis is given. 



Lacroix, A. "Sur quelques roches volcaniques melanocrates des 

 Possessions frangaises de I'ocean Indien et du Pacifique," 

 Comptes Rendus, CLXIII (1916), 177-83. 



Describes and gives analyses of two rocks which "are more calcic than felds- 

 pathic picrites, generally a little more ferruginous, and a little richer in silica. 

 They are separated from the picrites in that their pyroxene is in excess over 

 olivine.' Further the quantity of light-colored constituents is often a little 

 greater." No mineral percentages are given, consequently it is diflScult to 

 place it. Possibly a labradorite ( ?) bearing picrite. To it is given the new 

 name ankaramite. 



Lacroix, A. "La constitution des roches volcaniques de I'Ex- 



trertie Nord de Madagascar et de Nosy be; les ankaratrites de 



Madagascar en general," Comptes Rendus, CLXIII (1916), 



253-58. 



Melanocratic nephelite-basalts with considerable feldspar and phenocrysts 



of olivine, titaniferous augite in the form of microlites, ilmenite, often perof- 



skite, and biotite are given the new name ankaratrite. The nephelite never 



forms more than 10 to 15 per cent of the rock and is in many cases accompanied 



by melilite. With simply a description for a definition, its relationship to 



other rocks is indeterminable. 



A granular rock formed of augite and nephelite with a little olivine, biotite, 

 apatite, and some orthoclase is called fasinite. Rosenbusch's definition of 

 bekinkinite would cover this rock, but Lacroix says the rock from Bekinkiny 



