MANGANESE NODULE (POLYMETALLIC), Pacific Ocean XMN019 Barb 4 cm x 4 cm

4 cm x 4 cm x 1 cm approximately

Weight - 266 grams

Age-Proterozoic 800 million years old

bamboo Agate

MANGANESE NODULE (POLYMETALLIC), Pacific Ocean XMN019 Barb 4 cm x 4 cmManganese Nodule (Polymetallic) Clarion Clipperton fracture zone Pacific Ocean Total Weight: 5. 38 grams Approximate dimensions: 22mm x 20mm x 19mm 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.