“The impressive standing stone at Strontoiller is a rough-cut pillar, standing some thirteen feet high, which was used in healing rituals. It is said to mark the grave of Diarmid, the mythical hero. The adjacent cairn was excavated and some cremated bone was found. Quartz chips and pebbles were found under the kerbstone: quartz is often associated with burial sites in the west.”
Magic and Witchcraft in Scotland
by Joyce Miller.