88 Diorites and Granites of Swift's Creek 



19. Granule of microcline, probably parallel to the macropinacoid, 

 from aplite, Swift's Creek. 



20. Intergrowth of hornblende and pyroxene from Riley's Creek, 

 (a) Colourless pyroxene (diopside), having an inclination of the 

 plane of vibration of 44° ; (b) green dichroic hornblende, having 

 an inclination of the plane of vibration of 16° 30'. 



21. Chloritic alteration of hornblende, (a) Green dichroic 

 hornblende ; (b) green dichroic chlorite. 



22. Chloritic alteration of hornblende. (a) Green dichroic 

 hornblende ; (b) green dichroic chlorite ; (c) magnetite. 



28. Intergrowth of mica and hornblende from the anorthite 

 diorite, Sheep Station Creek Gap. (a) Dark brown dichroic magnesia 

 mica, showing the basal cleavage ; (b) the same mica seen in the 

 direction of the axis c, brownish-red, not dichroic ; (c) dark-green 

 dichroic hornblende. The mica has a small optic axial angle, and is 

 probably phlogopite. 



24, 25. Chloritic alteration of magnesia mica, (a) Dark-brown 

 dichroic magnesia mica ; (b) fibrous green chlorite, dichroic in 

 shades of metallic green ; (c) magnetite. 





