THE GEOLOGY OF MITTAGONG. 309 
No. 9. Locality, Jellore Creek, at foot of Mount 
Jellore, near Mittagong. 
Texture—Hypautomorphic granular. 
Fabric—No base is present. The rock is composed of 
comparatively large crystals of augite, together with 
masses of magnetite, serpentine and smaller crystals 
of plagioclase. 
Minerals present (7° by weight, by Rosiwal’s method)— 
Serpentine = es Ar ae ate 0 
Augite ... ae ws a sos we «6245 
Magnetite - a: Re aN soit pete 
Plagioclase a es on wee a aD 
eS | accessory 
Serpentine has usual fibrous appearance due to decompo- 
sition of olivine. It is present both of rich green colour 
and as colourless fibrous tufts. 
Augite.—Large idiomorphic crystals showing strong 
cleavage. 
Magnetite is very massive in this slide and appears to 
have formed round the serpentine and felspars. Several 
of the latter are enclosed bodily. 
Pyrites of yellow metallic colour by reflected light 
accompanies the magnetite. 
Biotite occurs sparsely as small fibrous squares with 
strong pleochroism. 
Order of Consolidation. 
Serpentine (Olivine) 
Augite 
| 
Plagioclase | 
magnetite 
| pyrites 
