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



391 



Lawsonite gneiss. Three miles west of Redwood. III. 2, 7. 



Ophitoblastic structure. Titanite, lawsonite, ilmenite, hema- 

 tite, rutile with leueoxene. Glaucophane in large crystals: C = 

 Prussian bine, 6 = purple violet, ft = gray; some lamellae are 

 quite uniaxial. In sect. III. 7 the glaucophane has paler colors; 

 2 V small. 



Lawsonite gneiss. Helmann ranch. III. 3, 14. 



Ophitoblastic structure. Glaucophane in some lamellae very 

 pale with 2 V very large ; extinction angle very small. Titanite, 

 lawsonite in glaucophane, but also glaucophane in the lawsonite 

 crystals. 



Epidote schist. Hooper Dairy, Schrader Tract, near Red- 

 wood. III. 11. 



Epidote, lawsonite, pyrite, chlorite. Karinthine: C = green- 

 ish blue, b = dirty olive-green, a = yellowish to colorless. C = t) 

 >8; ext. -14°; hemitropic lamellae; grown together with 

 glaucophane. Glaucophane: C = ultramarine blue, b = purple 

 violet, 3 = yellowish to colorless; ext. -15° (probably not on 

 (010)); y — a as usual, y — j3 = 0.006 ; 2 V large. In some 

 lamellae a colorless zone occurs between glaucophane and karin- 

 thine. Karinthine passes into chlorite. 



VI. 3. Loc. ? Ilmenite with leueoxene, chlorite, actinolite. 

 Hornblende (karinthine or soretite) : C = dark brown green, b 

 = brown-green, a = straw yellow, with edges of bluish karin- 

 thine and here and there patches of glaucophane, especially on 

 the prolongation of a chlorite vein. Karinthine shows hemitropic 

 lamellae. Ext. -19°, y — £ = 0.009 ca. ; axial plane (010) ; 2 V 

 large ; negative. 



Eclogite. Hilton gulch, Oak Ridge. VII. 5, 9, 6. 



Epidote and zoisite, margarite, rutile, inclosed in amphibole 

 and free, titanite. Karinthine: ext. -23°; negative; 2 V large; 

 axial plane, parallel to (010) ; with edges and patches of glauco- 

 phane in pale colors. 



Glaucophane schist. Belmont School, Belmont. VII. 19. 



Margarite, much titanite (leueoxene) with centers of rutile, 

 lawsonite, chlorite in veins and fissures. Glaucophane in colors 

 of medium intensity; karinthine: C= bluish green, etc. Ext. 

 -23°. 



