Hi Simon, not granite or basalt , looks like some sort of river amalgum with lots of quarts showing , my guess anyway and i am no expert , maybe Wal&Liz can enlighten you ? perhaps if you bust it up there
might be a gem or two inside .
I wouldn't give up on the one piece, by the size and shape of the quartz, it looks like it has settled at the bottom of a turbulent hole at some stage in prehistory. It might be worth crushing a bit more up and seeing if any prizes jump out.
Hi Wally what u mean by prizes jumping out (gold or gemstones) and y would it be down so deep in the river could I build a sluice box to run every thing through and will it catch the gemstones I'll have to build a pot n dolly to crush it
Actually I think it may be a chunk from a Pegmatite. Pegmatites hold all sorts of chunky crystals and minerals, could be some very nice finds to be made nearby if it is.