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At the very top of the first photo you can just see the edge of the steel ruler I used to show the scale, I just cropped a bit too much off the photo to bring the size down. The markings visible on the ruler are 1 mm.
Someone suggested that as the face in the first photo has so obviously been melted, it might be volcanic, which of course still begs the question: How did it end up buried in my paddock, over 1/2 km from the nearest road?
I'm also going to see if Goulburn has any professional 'rock lickers' who might be able to help.
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