Halkirk was one of the two inhabited planets of the Loomis System.

The Republic of Loomis' capital of Elgin City was located on its surface, as was the town of Glen mo Chrìdhe. It was settled predominantly by colonists of Scottish ancestry. The planet had some very valued commodities like silver oak wood, which was greatly appreciated by sculptors in the Solarian League. Once Solarian cartels moved in with the help of the OFS, the logging became so extensive that silver oak became an endangered species threatened with extinction within about twenty T-years from 1922 PD. (SI4)