Manganese nodule
![Lumpy but round rock has been broken open and inside is a bright center surrounded by dark.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/HeinMnNodule.png?itok=HDoIdJ8S)
Detailed Description
A manganese nodule from the Cook Islands EEZ from Hein et al., 2015.
Sources/Usage
Public Domain.
Critical metals in manganese nodules from the Cook Islands EEZ, abundances and distributions
Ore Geology Reviews
Volume 68, July 2015, Pages 97-116