This page lists the stone types found in Middle-earth, aside from the vanilla stone block.
The anglo-saxon stan-rune ᛥ (= letter ST) means "stone". Tolkien used those ᚱᚢᚾᛖᛋ for some texts in the initial drafts of "The Lord of the Rings", later on, he replaced them by cirth runes. Sorry, no quote (not included in the Old English rune poem).
All items (6)