.44 E. Teale: 



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



The rock is moderately coarse-grained; about t-wo-thirds consists 



•of felspar, mostly as relatively large rectangular plienocrysts. with 



.a small amount of later micro-spherulitic felspars moulded on 



them. Ihe phenocrysts are mainly albite, or Ab,,^ AHio, baving 



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



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



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

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

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

 tized to granules of epiclote 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 elonga^ted crystals, and is more or less 



.altered to leucoxene. 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 

 right angles and granular epidote is also a^ociated with it. A 

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



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



No. 15. — Coanpact 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. The 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 

 <;an 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 tlie rock. One large phenocryst of plagioclase now 

 •consisting mainly of chlorite and secondary felspar, Avas 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. 



