The Crystal Cave, located in Put-in-Bay, Ohio, is a limestone cave with walls displaying crystals. It is now a tourist attraction open to the public. Put-in-Bay, Ohio, looking out towards Lake Erie Put-in-Bay is an incorporated village located on South Bass Island, Ottawa County, Ohio. ...

In 1887 Mr. Gustav Heineman emigrated from Baden-Baden in Germany to Put-in-Bay, Ohio. In the following years he established a winery, which is still well-known for its high quality wines today. In 1897 he sank a well beneath his winery and discovered a large vug in 10 m depth. On exploring the cave he found, that much of the cave walls showed extremely large and well developed tabular crystals, which turned out to be strontium sulfate, i.e. almost pure celestite. Celestite (SrSO4) is a mineral consisting of strontium sulfate. ... Clear grey-blue celestite crystal crust from Madagascar Celestine from the Machow Mine, Poland. ...

The original cave was much smaller than what is shown today, as much of the celestite crystals were mined for the manufacturing of fireworks. However, Mr. Heineman decided very early to stop the mining activities and turned the property into a tourist attraction called "Crystal Cave". This turned out to be an excellent idea, as the Heineman winery survived the times of prohibition thanks to tourist guiding through their cave, while other wineries in the vicinity went into bankruptcy. The Sydney Harbour Bridge and the Sydney Opera House illuminated under New Years Eve Fireworks 2005 A fireworks event (also called a fireworks display or fireworks show) is a spectacular display of the effects produced by firework devices on various occasions. ... Prohibition agents destroying barrels of alcohol. ...

The Crystal Cave today is open to the public on a daily basis and still displays remarkably well developed, glistening tabular, white to slightly blue crystals of celestite up to 1 m size, whereas the overall size of the cave is about 10 m. They form extensive linings on the limestone walls of the cave. Apparently not much scientific work has been done on the celestite crystal and its formation is still fairly poorly understood. There are some limestone caves nearby, but all of these lack any significant celestite mineralization. Limey shale overlaid by limestone. ...