Vol. 4] Murgoci. — Classification of the Amphiboles. 389 



glaucophane less (6°— 10°), and crossite also 19° in the same 

 direction as glaucophane and karinthine. 



The transformation of glaucophane into crossite seems to be 

 posterior to the genesis of glaucophane and karinthine, probably 

 at the same time or even posterior to the filling up of the vein 

 with lotrite (?), actinolite, and iron mica. It seems that at the 

 time of the formation of the vein the glaucophane had suffered 

 an impregnation with a foreign substance, or a transformation 

 of FeO into Fe,0 3 , which had altered its chemical constitution 

 and optical properties. It is to be remarked that in some other 

 parts where glaucophane comes in contact with lotrite ( ?) one 

 cannot observe a pronounced variation in the color or in the op- 

 tical properties of the glaucophane. 



Eclogite. — Oak Ridge, Calaveras Valley. I. 10. Garnet with 

 rutile and ilmenite, the fissures filled with smaragdite ( ?), epi- 

 dote, titanite with rutile; rutile with leucoxene, karinthine. 



Eclogite. — Calaveras Valley. 1. Garnet with veins of chlo- 

 rite. Lawsonite, much titanite, omphacite. 



Glaucophane-gneiss. — Melitta, near Santa Rosa. II. 2, 3, 4. 

 Quartz, titanite, garnet with the fissures filled with talc ('?);. 

 much chlorite and margarite. Orthoclase, smaragdite. Karin- 

 thine with glaucophane very faintly colored; some patches of 

 more intensely colored glaucophane show 2 V very small. 



Another section of the same rock (II. 5) shows very large 

 crystals of titanite; garnet; rutile with leucoxene. Karinthine 

 shows: C = greenish blue, t) = green, a = yellowish; ext. = 

 20°; forms crystals with glaucophane showing: C = ultrama- 



Fig. 6. — Glaucophane, g, with patches of karinthine, k, shows edges of cross- 

 ite at the contact of a lotrite?, 1, with actinolite, a, etc. X 30. 



