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Hi I am slabbing Malachite and finding these small patches growing on the sides. Done a 9 14 18 carat acid test and the mark on the test did not melt, so I am thinking its gold. I work with gold and it certainly looks like it, are there other ways of telling Photos attached. Thanks for your...

Thanks Noel

Thank you, I will keep an eye out

Hi all! This is my first post and have just joined so here goes! My name is Lockie and I have been cutting opal for many years, but not boulder I have the 6 wheels nova machine and dremels with the small pink, grey, orange etc small wheels and many extra bits I also have boulder syringes with...