Tumbled Turritella Agate / 1-1.5" AVG - 1 LB. LOT Menu Obelisks particularly in the Ordovician period

particularly in the Ordovician period

this iron forms thin films of iron oxide inside cracks in the stone

Origin: Czech Republic

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Tumbled Turritella Agate / 1-1.5" AVG - 1 LB. LOT Menu Obelisks particularly in the Ordovician periodQuantity: 1 pound Average size range: 1 to 1. 5 inches Agate is a banded variety of chalcedony that forms inside pockets of metamorphic and volcanic rock, with the initial layer that forms and the surrounding minerals and conditions affecting subsequent layers and giving agate its wide variation in appearance. Turritella agate's unique appearance comes from the inclusion of snail fossils in the stone.