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Hi all posted the white one before, but been finding red ones aswell similar size and on scraping ive found what looks like calsite?? Strange one any ideas please also the stones came out what looks like a fish head fish head  approx 7 inches long they was inside the hole, stones are 2 cm thanks in advance 
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From Fish head shape

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Dirty Pete
Calcite will give off bubbles with acid (brick cleaner or strong vinegar). The rest looks like glass, quartz pebbles and the fish head is furnace slag, burnt limestone with gas bubble holes and a chunk of green/grey glassy slag stuck in it.

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Thankyou I've learnt something new I didn't now about the bubbles 👍
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