Hawaiite

Hawaiite is an olivine basalt with a composition between alkali basalt and mugearite.[1] It was first used as a name for some lavas found on the island of Hawaii.

In gemology, hawaiite is a colloquial term for Hawaii-originated peridot, which is a gem-quality olivine mineral. It occurs during the later stages of volcanic eruptions which happens to be when the alkaline metals are most present.[2]

References

Peterson, Gordon A. MacDonald, Agatin T. Abbott, Frank L. (1983). Volcanoes in the sea : the geology of Hawaii (2nd ed.). Honolulu: University of Hawaii press. pp. 127–129, 150–152. ISBN 9780824808327.
"Hawaiite: volcanic rock - pictures and overview". www.sandatlas.org. Retrieved 2018-04-07.

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[1] Peterson, Gordon A. MacDonald, Agatin T. Abbott, Frank L. (1983). Volcanoes in the sea : the geology of Hawaii (2nd ed.). Honolulu: University of Hawaii press. pp. 127–129, 150–152. ISBN 9780824808327.

[2] "Hawaiite: volcanic rock - pictures and overview". www.sandatlas.org. Retrieved 2018-04-07.

Types of basalts
Basalts by tectonic setting	Flood basalt Mid-ocean ridge basalt Ocean island basalt Volcanic arc basalt
Basalts by form and flow	Columnar basalt Pillow basalt Aa lava Pahoehoe lava
Basalts by chemistry	Tholeiitic basalt Calc-alkaline basalt Alkali basalt Trachybasalt Hawaiite Mugearite Picrite basalt
Important minerals	Olivine Pyroxene Plagioclase Amphibole Magnetite Ilmenite Quartz Cristobalite Trydimite