44 E. Teale: 



No. 12. — Locality east of No. 11, but on the same ridge. 



The rock is moderately coarse-grained; about two-thirds consists 

 of felspar, mostly as relatively large rectangular plienocrysts, with 

 a ymall amount of later micro-spherulitic felspars moulded on 

 them. Ihe phenocrysts are mainly albite, or Ab,,f, An^o, having 

 a refractive index as low as the mounting balsam, which is lesvs than 

 1-53. Some felspars are untwinned, possibly 010 sections, with 

 extinction angles, ranging from 3° -19°. Others show carlsbad or 

 albite twinning, or both. Syimnetrical extinction angles of 15°- 

 18° occur on the albite lamellae. Some of the felspar is saussuri- 

 tized to granules of epidote and zoisite. The bulk of the felspar 

 slightly preceded the augite in crystallizing, but in one place 

 augite and felspar are in micrographic intergrowth. A fair 

 quantity of ilmenite occurs in elongated crystals, and is more or less 

 altered to leuooxene. Clusters of radiating, brown, green or bright 

 red micaceous products occur. In one place crystals of a secondary 

 red micaceous mineral product radiate from the ilmenite at 

 ri^ht angles and granular epidote is also associated with it. A 

 little pleochroic aegirine-augite, with extinction angle of 29°, is 

 .also present. The rock may be described as an albite diabase. 



No. 15, — Compact diabase, from Four Mile Creek (analysed). 

 (See Plate I., Fig. 2.) There is very little felspar present, and this 

 consists of lath-shaped crystals and larger areas now altered to 

 zoisite and minute secondary mica flakes. Ihe rock consists mainly 

 of granular augite, with some areas of chlorite, a fair quantity 

 of ilmenite altered to leucoxene, and some granular pale brown 

 . sphene. 



This mineralogical content is in agreement with the high lime 

 . and magnesia, and low alkali content of the analysis. 



No. 16. — Spotted diabase from Four Mile Creek. In the hand 

 specimen light circular spots are noticeable, but are much less 

 prominent under the microscope. However, slightly lighter areas 

 can be seen, and appear to be due to the relative crowding of 

 minute more or less altered lath-shaped felspars, while a relatively 

 smaller amount of augite and chlorite occur in these areas than 

 in the rest of the rock. One large phenocryst of plagioclase now 

 • consisting mainly of chlorite and secondary felspar, was noticed, 

 and minute granular oxide of iron, with a little carbonate, occurs. 

 The augite is mostly granular in habit, with undulose extinction. 



No. 17. — Compact diabase from smaller diabase outcrop on the 

 /track to Ware's, and' south of Fry's. 



