238 MINERAL CENSUS OF AUSTRALASIA. 
Moisture va 1:07 
Carbonate of lime me +. 69588 
Silica ‘ ae 2-41 
Peroxide of iron aig Be 0-78 
Carbonate of magnesia seit) Ong 
100:56 ; 
Gladstone ! !, white and coloured marbles (R.), (Q. M. C); 
in very many auriferous reefs! !, a common form of 
gangue (L.); Toowoomba district !!, in cavities in 
basalt (L.). 
\CASSITERITE—Stanthorpe district |! !, stream tin in drifts, gene- 
rally in small water-worn crystals, with a large proportion 
of the ruby and amber varieties, sometimes together 
with water-worn gold (J.), as crystals in quartz reefs, 
and in dykes of greisen in granite country (J.); 
Pascoe River ! ! !, as stream tin ore (L.) ; Mount Spur- 
geon !! !, principally stream tin (J.) ; Kangaroo Hills !! 1, 
stream and lode tin (J.); associated with bismuth 
(Pears) ; samples of the pannned-off ore contain abso- 
lutely white water-worn grains of tin oxide (10-15mm. 
diameter). Awby and améer tin also occur (C.) ; Running 
Creek, Star River! ! !, stream tin, associated with 
garnet and topaz (J.); Granite Creek, Palmer Gold- 
field !!!, as stream tin associated with gold, latter 
having been derived from the slates which abut on the 
western banks of the creek, while the granitic eastern 
banks supplied the tin (Sellheim) ; Cannibal Creek ! ! }, 
stream and lode tin, the latter in large quartz reefs 
in slate and greywacke country (J.); Annan and 
Bloomfield ! ! !, stream and lode tin, the latter associated 
with quartz, tourmaline, hornblende, and wolfram,—prin- 
cipal mines are Mount Leswell, Lion’s Den, Mount 
Amos, Mount Romeo (J.); Mount Leswell, Cooktown ! ! 1, 
with tourmaline crystals, under the microscope the 
panned-off ore is mainly honey-yellow, with a little 
opaque black tin and a little rudy tin, the tourmaline 
is of a greyish blue and markedly pleochroic parallel 
to principal axis (C.) ; a specimen of schorl and tin ore 
assayed 55 per cent. of metallic tin (L.); Mount Amos, 
Cooktown ! ! !, with tourmaline crystals, under the micro- 
scope the cassiterite appears to be mainly transparent 
and of amber or honey-yellow colour, the tourmalines 
are greyish-blue and strongly pleochroic, parallel to 
principal axis (C.); Lion’s Den, Cooktown, ! ! !, with 
tourmaline crystals, microscopic examination reveals 
nothing of interest (C.), some of these Cooktown tin 
