Yttrium was a type of mineral. The planet Guiteica held extensive underground reserves of yttrium; as a result, many different pro-Imperial mining companies attempted to convince the native Bitthævrians to permit and engage in mining operations on the planet.
Vulca Minerals attempted to adopt a pushy attitude toward yttrium mining, which led to m'Yalfor'ac Order considering the execution of their leader. Eventually, Kadok Resources was assigned to manage all of Guiteica's exports.
- Yttrium on Wikipedia