Very interesting find

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Hey guys, I dug this from the alluvial gravels at chapel hill in South Australia. I have been told its rhyolite and it has never been found here at this spot and its found in qld so Im curious how it got here. What type of Rhyolite would it be I know there at lots of different types like rain forest Rhyolite ect. Any info and input would be fantastic. Cheers all.
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Gday Schultzy.

Goldirocks is a geologist and would be best placed to answer your question in the mineral identification thread. However, to me it does fairly closely resemble something called spherelitic rhyolite (spelling?) which is also referred to as "rainforest Jasper" and is found here in my neck of the woods in central QLD at a place called Mount Hay, which also produces thunder eggs. I think it's a particular kind of high-silica lava which has many little agate/chalcedony nodules embedded through it. I can't post links from this device but if you google Mount Hay gemstone tourist park you should see some nice photos of the stuff. They get big slabs of it there that I've seen made into very nice looking coffee table tops.

Cheers
 
By the way, as an avid fossicker I can tell you that you would be surprised at the sorts of things that turn up at places where no one has heard of them being found ;)
 
Probably easier for you to copy what you have above and tack it onto the mineral identification topic as a seperate post ( I can't move the whole topic into another).
 
speaking of rocks in the wrong place,, we were in darwin late last year and went out with the local club on a roadside specing day. the trucks were delivering quarried road fill from a local property and the dirt has Amethyst in it. I found 2 3 inch long tooth shaped crystals, There is not supposed to be amethyst in that area

ray
 

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