48 PROCEEDINGS OF THE ROYAL SOCIETY OF QUEENSLAND, 
An Unusual Tourmaline-Albite Rock from 
Enoggera, Queensland. 
By W. H. Bryan, M.Sc., 
Lecturer in Geology and Mineralogy, The University of 
Queensland. 
(Plate IT.) 
_ (Read before the Royal Society of Queensland, 28th May, 1923.) 
(I) Introduction. 
(II) Field Occurrence. 
(III) Descriptive. 
(IV) Chemical. 
(V) Discussion— 
(a) Mineralogical. 
(b) Structural. 
(VI) Conclusion. 
Plate. 
(I) INTRODUCTION. 
THE remarkable rock which forms the subject of this 
paper was discovered in the year 1914 by the author on the 
Cedar Creek road, bétween portions 313 and 314, parish of 
Kedron, about 7 miles north-west of the City of Brisbane, 
in the State of Queensland. 
The only previous record of this rock is a short reference 
in the author’s “ Geology and Petrology of the Enoggera 
Granite and Allied Intrusives, Part I’’.! 
(II) FIELD OCCURRENCE. 
The rock to be described forms a band about two feet 
in thickness some 25 yards outside the contact of the “ Enog- 
gera Granite” (of Permian age) with the Brisbane Schist 
(2 Ordovician). This band can be traced for fifty yards in a 
1 Proc. Roy. Soc. Qld., vol. xxvi, 1914, p. 153. 
