Microliths, probably of bornblende, occur, and apatite often penetrates tbe 
hornblende, and is easily recognised by its glaring limpidity, and when cut transversely 
on oP the crystal sections are, of course, hexagonal and isotropic. 
Magnetite occurs as in other Charters Towers rocks. 
CoTJET IIorsB Rksebte, Ciiaeters Towers (Qtjee!tslaisd). 
Surface boulder, weighing several tons 
Is very similar to the last, except that, being a surface stone, nas suffered from 
weathering, the result of which is that there are few minerals fresh enough to be of 
much interest, except the quartz, which is exceedingly rich in fluid and gaseous inclu- 
sions. Magnetite abounds. 
The triclinic felspars show marked cleavage, rectangular to the striations ; and 
the orthoclases show striae. The minerals of secondary origin are similar to the other 
Charters Towers samples of granite. 
United Queen Consols Eeef, Charters Towers (Queensland). 
“ Deep ground.” 
Differs from the North Australian sample in the sparseness of hornblende and 
its derivatives. 
The constituents are granular quartz and felspars, with an occasional jirism of 
actinolite. The rock sometimes has blade-like cry,stals of green actiiiolite, two or three 
inches long. The felspars are like those occurring in the Cooktown granite, No. 14 
showing the white ruled surface by reflected light, the ruled lines being transparent by 
transmitted light, and being extinguished parallel to the principal section of the polarizer 
between crossed nicols. 
A little chlorite showing feeble absorption. No epidote. Magnetite, or apatite, 
and the felspars and quartzes, as a rule equal in size, measuring '01 inch. 
No. d. Star Eiver (Queensland). 
E. L. Jack’s Collection. Sp. Gr. 2'69. 
Colour, dark-grey. A medium-grained rock with quartz, felspar, and black mica 
(biotite) in fairly equal proportion, and -a little hornblende. 
Section . — By reflected light, pure milk-white felspars, other limpid felspars, 
clear quartz, and dark mica, some black-lustered mineral enclosed in mica and a very 
little light greenish brilliant epidote. 
Felspars . — Some of the triclinic felspars are exqui.sltely marked, the crystals 
being fresh and the bands extremely fine and sharp. The finest in the slice is '08 inch 
long by about ‘027 inch broad.* There are twenty-twm parallel lines, whose extinction 
right and left of the normal to the twinning plane J/is 6'^ and 6° 10', respectively, so 
the section must be about exactly normal to the twinning plane. Another felspar gave 
22° 10' and 22° 30' on either side of the boundary lines between the lamella;. Some of 
these felspars are not uniform in their orientation, and some of the orthoclases show 
zonal structure. The inclusions in the plagioclascs are numerous ; some consisting of 
clear, colourless, rounded grains; and others similar, but green. With these are black 
opaque grains, probably magnetic iron, also trichites. The orthoclases are very dusty, 
with possible kaolin. The hornblende fringed with epidote in places, sometimes highly 
* None of my microscopic measurements are exact, a.s they have been detei'mined with a stage 
micrometer. 
