Please have a look at this video.
An Australian Boulder Matrix Opal is a opal mixed with the parent rock (ironstone) rather than having been deposited in seams or potches, like boulder opal.
The parents rock is called ironstone, and it is exclusively found in Queensland.
My boss sometimes decides to carry a good quality Boulder Matrix.
Some people say that high quality Boulder Matrix has a charactor like twinkling neon lights of a distant city...
Do you see it in this opal!?!?
( I DO!!!!)
Have a lovely day xxx