7.5" Septarian Slab DS2228

7.5" Septarian Slab Approx. Dimensions: 7.5x6.25x0.5 inches Approx. Weight: 909 grams Locality: Mexico Slab stand is included. Septarian, a distinctive sedimentary rock, forms through the combination of calcite, aragonite, and limestone with organic matter and minerals such as iron sulfide. It develops in concretions within sedimentary deposits, often found in regions with ancient seabeds, notably in Utah, USA, Madagascar, and Morocco. These concretions undergo a process of cracking and subseque