Mineralogical notes. 1. Precious opal from White Cliffs, N.S.W. 2. Basic sulphate of iron from Mount Morgan
Abstract
1.Precious opal from White Cliffs, NSW.
On examining a cut and polished specimen of a fossil-bearing ferruginous sandstone boulder from White Cliffs, N .S. Wales, I was struck by the appearance of the precious opal which had replaced the carbonate of lime of the shells. The rock is permeated with the opal, and particularly when polished has a very beautiful appearance. The minute surfaces in the interior of the opal which produce the play of color; when viewed with a lens, appear to be quite flat and terminated by perfectly straight edges often parallel.
