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crystals form on the geode's ‘gas cavity’ walls
From the Hamar L’Aghdad Formation
A mini 'shoal' of fossilised Knightia fish in a limestone matrix
Height 6cm
circa 340 million years old
Ammonite Dactylioceras nodule urchin crystals form on the geode'sOur most popular fossil, an ammonite nodule which captures the ammonite and its negative within a split rock. Ammonites from this UK region contain iron pyrite, or fools gold, giving them a natural glimmer. Jurassic, circa 180 million years old. From Whitby, Yorkshire, England. The ammonite will be approximately 5cm 7cm. The nodule itself may be bigger. Measurements are approximate and the minimum size you should expect your item to be.