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University of California Publications. 



[Geology 



Epklote schist. VII. 20. 



Much epidote, margarite. Karinthine : C = blue, fa = dirty 

 olive-green, a = yellowish; ext. -19°; 2 V very large. Glauco- 

 phane in pale colors; C — azure blue, fa = violet, a = yellowish 

 to colorless; ext -5°; 2 V small; negative. 



Quartzite (gneiss). Belmont. VIII. 6, 7, 8, 9. 



Brown garnet, magnetite, leucoxene, hematite, rutile, ilmenite, 

 muscovite, glaucophane in pale colors as sheaves and radial 

 spherulites. 



Quartzite. Pine Flat, Sonoma County. VIII. 10, 11, 12. 



Garnet, zoisite, leucoxene, ilmenite, hematite, muscovite (para- 

 gonite?) iron biotite. Glaucophane: C= Prussian blue; ext. 

 -6°; negative, 2 V small; with patches and nucleus of karin- 

 thine: ext. — 18°, C = bluish green, etc.; axial plane parallel to 

 (010) ; 2 V large, negative. Polysynthetic lamellae. Here also 

 the actinolite with transverse axial plane described above. 



Eclogite. Eeed Station, Tiburon. 



Karinthine (orsoretite) as lamellae with end faces : c =bluish 

 green, fa = olive-green, a = yellow. Ext. (C:e)=-26° axial 

 plane, (010) ; 2 V large; negative. Some lamellae with patches 

 and edges of glaucophane. (Fig. 8.) 



Fig. 8. — Karinthine crystal, k, with edges and zones of glaucophane. X30. 



Quartzite (and mica schist). Tiburon, H miles southeast of 

 Eeed Station. 



Idioblastic quartz with many inclusions of liquids with bubbles. 

 Zircon, garnet in small crystals with optic anomalies, sometimes 

 inclosed in crossites ; titanite. Muscovite, bent in the crushed 

 zones of the quartz. Brown iron biotite, often in radial lamellae, 

 with a slight pleochroism: C = dark brown, & = yellow brown; 

 negative, nearly uniaxial. Crossite: C = violet, fa = Prussian 

 blue, a = yellow ; it occurs as needles and lamellae ; some needles 



