Bill Heim Bill Heim @bill-heim Northern Virginia ActivityProfile3DFriendsSpecimensGroupsForumsFiles Topics StartedReplies CreatedEngagementsFavorites Search topics: Forum Topics Started Viewing topic 1 (of 1 total) Topic Voices Posts Last Post Rocks and Minerals Started by: Bill Heim in: What Is It? 1 1 3 years ago Bill Heim Viewing topic 1 (of 1 total)