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Crinoid Fossil
Late Permian
5cm x 2cm - 32
5cm x 2cm - 10g
Specimen 2: 6cm x 4cm x 3cm - 44
MANGANESE NODULE (POLYMETALLIC), Pacific Ocean XMN030 Smudge Crinoid FossilManganese Nodule (Polymetallic) Clarion Clipperton fracture zone Pacific Ocean Total Weight: 1. 84 grams Approximate dimensions: 17mm x 12mm x 12mm Comes in a membrane display box. Manganese nodules are found on the deep ocean floor. The nodules are mainly composed of iron and manganese oxide, but may also contain nickel, copper and cobalt. It is estimated that the nodules grow at an extremely slow rate of only a few millimetres per million years.
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