MANGANESE NODULE (POLYMETALLIC), Pacific Ocean XMN021 Late Cretaceous Approximate dimensions: 16cm x 11

Approximate dimensions: 16cm x 11

Approximate dimensions: 19cm x 15cm

Weight: 489 grams

Total Weight: 245 grams

Metal (gold) coated quartz

MANGANESE NODULE (POLYMETALLIC), Pacific Ocean XMN021 Late Cretaceous Approximate dimensions: 16cm x 11Manganese Nodule (Polymetallic) Clarion Clipperton fracture zone Pacific Ocean Total Weight: 3. 58 grams Approximate dimensions: 20mm x 16mm x 15mm 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.