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to transparent
Grape Agate
Total weight: 941 grams
Total weight: 78 grams
Total weight: 187 grams
MANGANESE NODULE (POLYMETALLIC), Pacific Ocean XMN024 Polished to transparentManganese Nodule (Polymetallic) Clarion Clipperton fracture zone Pacific Ocean Total Weight: 5. 57 grams Approximate dimensions: 27mm x 17mm x 14mm 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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