My wife Patti was a science teacher at Upper Moreland for 35 years. She has a collection of sands from beaches the world over. Some are from her students' travels, and some are from hers. It's all sand from different exotic places, some in jars, some in plastic bags.
On a trip to Hawaii many years ago, Patti got sand from a black beach and sand from a coral beach, both on the Big Island of Hawaii. The one beach that she wanted to get sand from was the green beach, one of only four in the world, on the farthest southern point of the United States, also on the Big Island. She tried, but did not make it because it entailed a two-mile walk over desertlike terrain. The wind was blowing about 40 m.p.h. and she didn't have the proper shoes or water.