SplendidSands
Exploring the Science and Beauty of Sand
Olivine Sand
Olivine and other grains. Le Tremblet Beach, Reunion Island, France.
Leo Kenney
Olivine is named for its olive-green color. It is almost exclusively found in dark-colored igneous volcanic rocks such as basalt, gabbro and peridotite. It is especially common near volcanic oceanic islands like Hawaii, the Galapagos, and on Alaskan islands.
Olivine is a common ortho-silicate mineral that is actually a mineral series, not a single mineral. Its iron and magnesium components can vary in proportion, substituting for one another in the crystal structure. This results in colors ranging from green to yellow green. Olivine tends to break down or weather quickly at the earth surface.
Gem-grade olivine is known as peridot, the August birthstone.
Big Island, Hawai’i
Iceland
Savoonga, St. Lawrence Island, Alaska
Marquesas Islands, French Polynesia
Lanzorote, Canary Islands, Spain
Ascension Island
Reunion Island, France
Pomorie, Bulgaria
Umatac, Guam
Rome, Lazio, Italy
Alajuela Province, Costa Rica
San Blas Indian Reservation, Arizona