698 GREAT SERPENTINE BELT OF NEW SOUTH WALES, iii., 



Tiger Hill, opposite N.T., 390 ; on Wiseman's Arm Creek, north of 

 Attunga [M.B., 144], on Bungemullagalarno Peak [M.B., 275], 

 and north of Namoi River. They are fine-grained rocks, usually 

 pink in colour, with abundant, small crystals of green hornblende. 

 Rarely, in the freshest specimens, they are grey. Microscopically, 

 they are seen to be chiefly composed of lath-like felspar, orthoclase 

 dominating over plagioclase, while there is a good deal of intersti- 

 tial quartz. The hornblende-prisms are up to 2 mm. in length, and 

 are passing into chlorite. A little apatite and magnetite occur, 

 also a small amount of secondary calcite. 



Augite-vosgesite occurs on Deep Lead Creek, Mt. Sheba [N.T., 

 207]. It is a light greenish-grey, fine-grained rock, with patches 

 of dark chlorite, which weathers easily, giving a pitted surface. It 

 consists of idiomorphic, thick, fresh prisms of augite, about 1 mm. 

 in length, set in a very fine-grained ground-mass of thin augite- 

 prisms, and plates of chloritised biotite, on a background of fel- 

 spar, chiefly orthoclase, and a little quartz. Some calcite is pre- 

 sent, and masses of chlorite, with quartz and calcite, occur, pro- 

 bably replacing augite. 



N.T., 77, which occurs as a dyke on the slope east of the Peel 

 River, three miles south of Bowling Alley Point (Moonlight Creek), 

 may be classed as an odinite, though differing in some respects 

 from the type-rock. It consists of a network of acid plagioclase- 

 crystals, generally rather elongated, and sometimes 1 mm. in 

 length. There is a considerable amount of interstitial quartz. The 

 ferromagnesian mineral was chiefly hornblende, in long, thin 

 prisms, but it is now almost entirely decomposed to chlorite and 

 carbonates. 



A beautiful camptonite [M.B., 228] was found, unfortunately 

 not in situ, but as a boulder by the Manilla track, four miles south 

 of Crow Mountain. It is dark blue-black, fine-grained, and has 

 glistening mica-plates. It consists of small, idiomorphic crystals 

 of diopside, vivid brown biotite-plates, and large olivine-crystals, 

 the last completely replaced by quartz, carbonates, and pilite. 

 There is a little magnetite. The ground-mass is composed of finely 



