UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 4, No. 15, pp. 359-396 ANDREW C. LAWSON, Editor 



I.—CONTRIBUTION TO THE CLASSIFICA- 

 TION OF THE AMPHIBOLES. 



II.— ON SOME GLAUCOPHANE SCHISTS, 

 SYENITES, ETC. 



BY 



G. Mukgoci. 



CONTENTS. 



PAGE 



Introduction 359 



I. Amphiboles of the Glaucophane Schists 361 



Glaucophane — Crossite — Rhodusite 362 



Gastaldite — Glaucophane 362 



' Crossite 365 



Rhodusite ( Abriachanite) 368 



Croeidolite (?) - 369 



Relation between Optical Properties and Chemical Composition 



in the Glaucophane Series 371 



Karinthine Amphiboles; Common Hornblende 379 



Karinthine, Pargasite 379 



Laneite (n. v.) 384 



Aetinolite ; an Actinolite with Transverse Axial Plane 386 



II. Materials Studied 387 



Glaucophane Schists 387 



Syenites, etc 393 



Conclusions 395 



INTEODUCTION. 



Recent researches on the amphiboles have shown quite clearly 

 that in this important group of minerals, especially in the mono- 

 clinic series, there are still many questions to be solved. The 

 amphibole family is far from having the same simplicity and 

 clearness in classification, the same facility in the identification 

 of minerals and names, or the same precision in the physical and 



