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Hey guys I have a few rocks that need IDing as I want to sell them thanks also how much do you think they are worth
These are all agates, though one has coarse crystals (probably quartz as well); not sure about the last one (the black dendrites are confusing me; can't tell if they're just on the surface or in 3D).
Value: I'd be guided by what similar items have sold for recently in the same marketplace.
In the case of eBay: tick 'completed listings' on the left of the eBay page and search for agate / geode / etc.
You could also browse the 'Rocks/ Fossils/ Minerals' category - http://www.ebay.co.uk/sch/Rocks-Fossils-Minerals-/3213/i.html