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I don't think that you are allowed to land an aeroplane on the A1, Anthony,
Yes, Lesley.... volcanic 'glass'.... obsidian... is quite common after volcanic eruptions... it can be found in quite large pieces and 'stones' (though they're not minerals, being formed without crystals) can be cut/facetted from it for use in jewellery... I have some obsidian from Mount St. Helen's in earrings.