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How heavy is Greenstone?


We have been gold prospecting in this river a lot recently and whenever we seem to get down deep to the bedrock layer and process out our concentrates there always seems to be a decent bit of greenstone pebbles in amoungst the concentrates and we almost never find it on the surface but always quite a bit down the bottom of the hole and it often stays in the sluice so it had me wondering how heavy is greenstone? I never assumed very heavy but it always seems to be staying in the sluice and now its getting to the point where I feel like oh look some greenstone that means gold here, but I never assumed it was that heavy but maybe im wrong, or is there something weird about it that makes it sink to the bottom of the creek other then weight?

Thanks a lot if any of you guys know anything that would be appreciated :slight_smile:

About the same as most other gemstones…are you able to post a photo?

All rocks have a specific gravity eg serpintine 3.0 and greenstone 3.1 can determinate the true nature of each rock.Just got o work out weight and formula…good luck with that!?

Greenstone is waxy so rub it. It is heavier thou hence why it distributes in certain places on rivers or beaches. Always keen to see a photo but if it is greenstone you shouldnt broadcast it too loud

Cheers, really its only smaller pieces the biggest found was probably only around 100G but normally the ones we find are normally pebble type size ( around the size of a 1 ounce gold nugget or smaller) they are more of lighter green then the stuff you see at mueseums and stores etc but that is probably because of impurities etc but I am 90% sure its greenstone. Next time we are up there I will send you some pictures, it is pretty smooth in general as far as I reamember, it may also be serpentine im not sure, but it comes from one of the tributarys of the grey river on the inland side if that gives any indication. Its probably just easy for me to grab a bunch of pieces and weigh them up compared to similar sized rocks and see what they come up like XD.

Thanks for the info :slight_smile:

A few photos will do the trick. Rub it on the side of your nose and get some oil on it. Should be waxy

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Hi, I found a little bit of material we brought back from our last trip, in our garage and it had a few smaller pieces of greenstone (well if it is that) it had both the brighter green pieces and the darker green pieces but they were all small so it was hard to get good footage sorry .

Interesting. It could be greenstone. Soak it in a drop or two of olive oil overnight. Wipe it dry and sit it somewhere. If it still has a lustre in a few days it is likely to be greenstone. What river are you working?

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Ok I will do thanks for that. I have to keep the river we are working under wraps but its a private claim not far from Ngahere. But I can tell you that when we prospect in Goldsborough we get the same looking stuff in similar stuations not as often but there is still a fair bit of it.

All good. There is pounamu there. At ngahere and goldsborough. Good luck. Bigger rocks are scalloped with a concave and convex side and creamy to bricky red. The shape is the giveaway not the colour

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