Journal Royal Society, N. S. Wales, Vol. XXX., 1896. Plate XVII. 
FIG. 1.—OPAL IN A MATRIZ OF SILICEOUS IRONSTONE, QUEENSLAND. One-half natural size. 
| 
FIG. 2.-OPAL, AS FOUND IN SEAMS, WHITE CLIFFS, N. S. WALES. One-half natural size, 
J. M, Curran, Photo. Enameline Photo. Eng. Co. 
OPALS, NEW SOUTH WALES AND QUEENSLAND. 
