augite, and magnetite. There is also a little secondary hfematite. 

 The plagioclase crystals go up to -04 in length, they are zoned and 

 often in binary twins. The hornblende is brown, up to -08 in 

 length. The augite is greenish, up to -045. It is subordinate to 

 the hornblende. 



Mt. Egmont, Taranaki. — Greyish-brown to red rocks with 

 scattered black hornblendes, and white felspars scattered or 

 crowded. Section : Ground-mass crystallitic, either moderate or 

 small in quantity, globulitic, a colourless glass generally dense 

 with granules of magnetite or of haematite, and containing scattered 

 microlites of felspar and occasionally of augite. No fluxion. The 

 porphyritic minerals are plagioclase, augite, hornblende and mag- 

 netite. The plagioclase crystals are small, not more than -02 in 

 some specimens, but usually they go up to -08 ; inclusions are 

 abundant, central or zonal. The augite is pale yellowish-green, 

 idiomorphic, the crystals large, from -04 to -08 in length. The 

 hornblende is brown, idiomorphic, usually with a wreath of mag- 

 netite ; it is less in quantity than the augite, but occasionally the 

 crystals are -15 x -04, usually they are much smaller. From both 

 the north and south slopes of the mountain. 



Mt. Bnapehu — A pale grey rock with scattered black hornblendes 

 and white felspars. Much resembles the H. Andesite from the 

 feugai-loaves. Section : Ground-mass abundant, crystallitic, 

 longulitic, colourless, with specks of magnetite. No fluxion. The 

 porphyritic minerals are felspar, hornblende, augite, enstatite, and 

 magnetite. There is a little secondary lutmatite. The felspars 

 are chiefly plagioclase, in crystals up to -08 x -06, but I saw a 

 smgle rectangular simple crystal which gave straight extinction 

 and may be sanidine. The hornblende is in long black prisms, 

 ■0( X -016. The augite is not common ; it is in small green 

 crystals about -01 in length. Tlie enstatite is in crystals up to -08 

 in length, changing from reddish-brown to bluish-green, and is 

 therefore hypersthene. It is quite subordinate to the hornblende. 

 i'rom the east base of the mountain. 



Coromandel, Thames District — A pale grey, compact rock, with 

 scattered black hornblendes and white felspars. Much like the 

 H. Andesite from the Sugarloaves. S.G. 2-4.5. Section : Ground- 



i crystallitic, longulitic, abundant, containing scattered felspar 



■olites and laths, with magnetite in rather large grains. The 



porphyritic minerals are plagioclase, hornblende, and magnetite. 



■ine plagioclase goes up to -10 in length, some crystal; 



posed in the centre, a few shew binary twins. The hornblende is 



hro,„ 1 ... .^^ ^^j^.^g 



/-. .^^., ^^'^ border. Another specimen is darker in colour. 

 ^- --67. It contains, in addition to the hornblende some yellowis 

 green augite, up to -06 in length, and often twinned. 



