i want to sell my large crystal quartz and amethyst geode in sydney. are there places that buy them?

Question

the smokey crystal quartz is roughly 12" by 12" by12" and weighs about 35 kilos and the geode is 18"long by 6"wideby6" high and weighs around 15 kilos and the amethyst stones are almost black

Answer 1

A rock and mineral shop might. A university might as well, though geology departments tend to be poor. You can always try eBay or if you don't have eBay in Australia, I am sure there is some other online selling platform.

Smoky quartz isn't worth too much and I'm not sure how much you could get for amethyst that isn't a nice, bright purple.