Can Anybody Suggest What This Rock Might Be?

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Currently on holiday in Scotland & wanted to have a hunt for some Scottish Gold. Using an SDC2300 these rocks give a signal like a rusty horse shoe - very loud. No rusty colour to the rock though to suggest ironstone. If anything it resembles blue stone. Also a lot of blackish/grey sand at edge of river at eddies, which also gives off strong signal with SDC. Didn't find any nuggets (yet), but found this 1921 George V Florin, which I was absolutely rapt with. Took about 20 minutes to dig out to, it was quite far down.SG ROCKS.JPG SG COIN.JPG SG COIN 2.JPG
 

mbasko

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More than likely iron rich basalt scoopy.

In some places basalt can be really reactive with a metal detector & others just a few rocks or even none at all.
 
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More than likely iron rich basalt scoopy.

In some places basalt can be really reactive with a metal detector & others just a few rocks or even none at all.
Thanks mbasko, I have also brought quarter of a bucket of black / grey sand back with me to our accommodation to pan, as I was getting a huge signal from that as well. I guess it could be ground up basalt. I've just been fooled by all the iron rich rocks I have come across in Australia being stained red.
 

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