Papakōlea Beach (also known as Green Sand Beach or Mahana Beach) is a green sand beach located near South Point, in the Kaʻū district of the island of Hawaiʻi. One of only four green sand beaches in the world, the others being Talofofo Beach, Guam, Punta Cormorant on Floreana Island in the Galapagos Islands, and Hornindalsvatnet, Norway(citation needed). It gets its distinctive coloring from the mineral olivine, found in the enclosingcinder cone. ~wiki
I’ll add more text specific to my trip soon..stay tuned..