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so after having a pond built I scrubbed of all the rocks collected but one in particular looks like no other rock I’ve ever seen. To me it looks just like a potato. It’s wrinkled and has nubs on it and it looks like it’s split and fused back at some point. It’s a great rock whatever it is. And cracking it would be awful spoil my potato 😀. I would appreciate if anyone knows thanks. 37B79607-72F4-41B0-B90B-C6580E4D9EF1.jpeg  D93D8D91-92C1-43B2-80DC-A386CC4E557B.jpeg  118A02DE-A7BA-426F-9F46-967D20363391.jpeg  648C4031-6187-4DF0-A04D-93D2DA58852E.jpeg  9D033983-9CCF-4DB0-AB13-64D819E73C37.jpeg  75F709DD-FE76-42B7-9C4E-BF3021C1BFEE.jpeg  A6BA0A28-43AD-42BF-8FBB-7FF1CBDC262E.jpeg  112FAFE7-565C-4EF8-B571-DF6F6DD1B6A7.jpeg  054EE336-22D3-4E10-AD8B-EEF25EC93D5D.jpeg  05DFCE0E-66FB-449E-B19E-7CA3B8CB7AFE.jpeg 
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Dirty Pete
Hi Kelly,
I'd guess it's an iron oxide rich, siliceous (quartzite?) pebble/cobble that's undergone stresses/strains to produce polygonal cracks. I would suggest it's from the Triassic pebble beds which are I believe present throughout the West Midlands. 

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Hello and welcome to the forum Kelly. I agree with Pete, an Iron rich cobble
Colin Huller
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