See --------> http://pennystockjournal.blogspot.ca/2013/11/ethiopian-welo-opals.html
See --------> http://pennystockjournal.blogspot.ca/2013/10/black-opal.html
|Yowah is a small town in outback western Queensland, Australia. Yowah is located 938 kilometres west of Brisbane and 132 kilometres west of Cunnamulla. The 2006 census revealed a population of 142.|
The town is famous for its opal mining and numerous opal fields that lie around the town as well as the "Yowah Nut" a local type of opal distinctive to the region. The area was first leased in 1883 to perspective settlers and opal mining has been the main activity ever since.
| ||The Yowah field is an occurrence of opal in siliceous ironstone nodules generally referred to as Yowah Nuts. These nuts have a spherical or ellipsoidal shape, and show alternate bands of light- and dark-brown siliceous ironstone. There is sometimes a kernel of precious opal, which is the main source of the gem.|
The nuts are found in layers (150–600mm in thickness) at depths up to 20m in a ferruginous sandstone, and are commonly associated with mudstone fragments or clay pellets.