It’s really no surprise that the Great Lakes Rocks & Minerals Facebook page has almost than 340,000 members, writes Tim Mulherin. First-time visitors to Lake Michigan, especially here along Leelanau County’s magnificent stretch of the big lake’s beach, are drawn to the stones, fossils and beach glass offered up with each wave that lands ashore. Even those who are not geologically inclined can’t ignore the eons-old rocky scatterings of water-glossed beauty at their feet. The photographs that especially get my attention are those displaying dozens of beach stones arranged for a self-congratulatory photo shoot. Typically, I’m moved to pose a single suggestive question: Catch and release? It often garners several laughing emojis. And yet… I’m serious. For years, my wife has discouraged me from collecting geological keepsakes for my ever-expanding collection: Petoskey stones, Charlevoix stones, agates, chain coral, and crinoids being my favorites. She habitually instructs me to return them before we decamp from the beach and head home.