HQRP-Crystal 2.5" Whole Iridescent Sutured Ammonite Natural Ammolite Fossil Pattern Stone Ancient Opalized Spiral Polished Mineral Shells - Madagascar + Acrylic Display Stand You will receive exactly this Sutured Patterns Ammonite - 63mm x 50mm x 17mm / 2 1/2 x 2 x 11/16 Inches; 67g / 2.4 oz (see photo, Stand included)! Ammonites have a wide range of size. Specimens have been found ranging from less than a centimeter to 2 meters in diameter. Early ammonites, until the middle Jurassic, were smaller, usually less than 9 inches or 23 centimeters. These fossils come from the Mahajanga River Basin, near the village of Ambatolafia of northwest Madagascar (left), located in the former province of Mahajanga/Majunga. They date from the Early Cretaceous period, Albian age (~100 to 113.0 million years ago) Chemical Composition: CaCO3 - Complex with impurities; Hardness: 3.5-to-4-Hardness; Mineral Class: Organic-(Fossil); Color: Brown, Gray; The different suture patterns tell us what time period the Ammonite is from. Geometric - numerous undivided lobs and saddles; eight lobes around the conch is characteristic of the Paleozoic Ammonites. Ceratitic - lobes have subdivided tips; giving them a saw-toothed appearance and rounded undivided saddles - Triassic Ammonites. Ammonitic - lobes and saddles are fluted; subdivisions are usually rounded instead of saw-toothed - characteristic of the Jurassic and cretaceous Ammonites. (The above information is provided solely for informational purpose. Kindly note that all stones are offered for decorative purposes only. Please, handle your stones with great care, do not grind or crumble them, do not dip or add them into your food or drink, do not use any parts of them in any elixirs, potions, lotions etc. Always make sure you wash your hands before and after working with your crystals.)