Orange coloured carbonate rock with cavity inside, lined with crystal to form a geode.
The cavity itself is probably the remnants of a sponge or echinoid that became buried in the sediment, but didn’t fossilise. the layers of the geode are an outer layer of mixed carbonate matter and quartz; a section of purer quartz in fine banded layers; and a final layer of larger sparkly quartz crystals, up to 1mm across, in the centre
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