I visited Staithes today on a day out with the kids and was surprised to find out from a local lad that the sea defence was made up of Larvikite from Norway. I was impelled to test its magnetic properties and found it to have equal attraction as the Stainton basaltic andesite, i believe the ingredient that links these two different rocks along with others is either Titan augite or Titonomagnatite.
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Please feel free to correct me on any part of my blog, i would also welcome any help that can be offered in correctly identifying some of my fossil finds All the best to all Heath.