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Tetragramma marticense sea urchins are a group of marine invertebrates found in nearly every ocean habitat—from polar waters to tropical seas
Long before fish dominated ancient seas
Its surface reveals angular shards of jasper in layered reds
calcite is typically the more stable mineral
Despite this extraordinary size
2.4" Rough Purple Purpurite Manganese Mineral Specimen Location Namibia Mosasaur Tooth Tetragramma marticense sea urchins areLocation: Namibia Weight: 4 Ounces Dimensions: 2. 4 Inches Long, 1. 7 Inches Wide, 1. 1 Inches Thick The item pictured is the one you will receive. Purpurite is a rare manganese iron phosphate mineral known for its distinctive purple coloration. Its name comes from the Latin word purpura, meaning purple. This mineral occurs in shades ranging from deep violet to reddish purple and is composed mainly of manganese phosphate, with the formula MnPO4H2O.
