710 
pleochroic, showing bright green, red, and yellow. Some of the hornblendes are 
pierced with apatite, its hexagonal section looking like holes. Some of the hornblende 
has a highly pleochroic tip or feather-edge, which for light vibrating parallel to the 
cleavage, is reddish-yellow, and at right angles, blue. Many microliths of hornblende 
in the quartz. _ . . , 
The quartz is not plentiful, but is allotriomorphic, full of small inclusions and 
microliths, much travei'sed by planes of inclusions, a few with very dark maigins 
pointing to gaseous, a few mobile pointing to fluid, and a few sporadic, probably glass, 
and a vast quantity of dusty particles. 
The mica is probably biotite, often pierced by apatite. 
Magnetic generally contiguous to the hornblende, and in the neighbourhood of 
apatite. The apatites are larger than usual, measuring about 001 x -002 inch. 
No. 77. Kippeh Point, Mount Elliott, neae Townsville (Queensland). 
11. L. Jack’s Collection. Sp. Gr. 2'628. 
Colour, reddish-brown. 
Eclspars, quartz, mica, and hornblende. Microscopically there appears to be 
more fcdspar than all the rest added together. Felspars orthoclase twins, Carlsbad 
type, rather altered, showing bright lines as described in the Cooktown and Etheridge 
granites, often interpolating felspars of the albite and oligoclase type with somewhat 
broad lamellffi. _ . , . , . • .i 
The rock derives its reddish-brown tint from the oxide of iron which stains the 
orthoclase. Plagioclase, very flue, large, the crystals delicately cross-hatched, looking 
like the plan of a building, but not guito rectangular. In the centre of these rhom- 
bohedral figures are inclusions of ferrite, haematite, apatite, and dusty matter. 
The apatite is plentiful and ranges in size from -OOo inch across the section of 
prism to ’0005 inch, and these latter are sometimes -01 inch long. Amongst the colonies 
of apatites are generally to be found greenish hornblende and magnetite. Epidote is 
rare. c i j 
Quartz sparse, containing the usual inclusions, which, however, appear tixea, ana, 
from the dark borders, may be glass. The quartz seems to be peppered with dusty 
particles and glassy inclusions. 
No. 76. -.Magnetic Island, neae Townsville (Queensland). 
E. L. Jack’s Collection. Sp. Gr. 2‘6I1. 
This rock is similar in every respect to the preceding, except that it appears 
more weathered, and perhaps carries more hornblendes. It obviously belongs to the 
same series. 
No. 25. Mount Catheeine, St. Helens, neae Mackay (Queensland). 
A. G. Maitland’s Collection. Sp. Gr. 2'6I. 
Colour, grey. Fine-grained, no mineral large enough to identify without a lens, 
microgranitic, holocrystalline. i,, j -.i 
Section— 'Qj reflected light, lath-like milky felspars ; green hornblende, the 
larger sections of which are pierced with pellucid apatites which shine like diamonds ; 
biotite in grains; and but little quartz; the, whole section literally peppered with 
magnetite. 
