Septarian Nodule Slab - Calcite Center - Dark Calcite Outline This stunning large slab of Septarian Nodule showcases a gorgeous calcite center framed by a dark calcite outline. Both sides display beautifully, making this an exceptional example of just how remarkable this material can be. The distinctive crackle patterns created by ancient bacterial processes make this a true geological wonder. SPECIFICATIONS • Material: Natural Septarian Nodule • Dimensions: 156mm x 142mm x 8mm (Inches - 6.1" x 5.6" x 0.3") • Weight: 365 grams (12.9 oz) • Origin: Utah, USA or Morocco • Rarity: Common • Condition: Unpolished slab - ready for your project Septarian Nodules are round formations where organic fossils were consumed by bacteria and replaced with calcite, creating distinctive crackle patterns. They can be hollow geodes with calcite crystals or solid with distinctive patterns throughout. Most take an excellent polish and work into quality cabochons or display slabs for collections. WHAT MAKES IT SPECIAL This piece features an impressive calcite center with dramatic dark outlining that creates striking visual contrast. The double-sided display quality makes this perfect for showcasing in any collection. PERFECT FOR • Display specimens • Cabochon cutting • Collectors of unique geological formations PHOTO NOTE: All photos wet to show polish potential, except last photo (dry) to examine natural flaws. Colors may vary on monitors. This listing is for the exact piece shown in photos.