<bgsound src="http://www.prcupcc.org/sounds/lithos.mid"> Alphabetical Directory of Stones
O

	Obsidian		Ocho		Octahedrite		Okenite		Oligoclase
	Olivine		Onyx		Opal		Orpiment		Orthoclase
			Osumilite		Overite		Owyheeite