Ankaramite

Ankaramite is volcanic rock type of mafic composition. It is a dark porphyritic variety of basanite containing abundant pyroxene and olivine phenocrysts.^[1] It contains minor amounts of plagioclase and accessory biotite, apatite, and iron oxides.

Ankaramite

Igneous rock
Composition
Mafic:pyroxene, olivine and plagioclase.

Its type locality is Ankaramy in Madagascar. It was first described in 1916.^[1] It is also found in the Sierra de Guanajuato of Central Mexico,^[1] the South Pacific on islands such as Tahiti, Rarotonga, Samoa and in the Zealandia, Alexandra Volcanic Group.^[2]

References

1. https://dialnet.unirioja.es/descarga/articulo/281059.pdf 2012-02-27 at the Wayback Machine Luis Enrique Ortiz Hernández, An Arc Ankaramite Occurrence in Central Mexico, Revista Mexicana de Ciencias Geológicas, volumen 17, número 1 2000, p. 34-44
2. Pittari, Adrian; Prentice, Marlena L.; McLeod, Oliver E.; Zadeh, Elham Yousef; Kamp, Peter J. J.; Danišík, Martin; Vincent, Kirsty A. (2021). "Inception of the modern North Island (New Zealand) volcanic setting: spatio-temporal patterns of volcanism between 3.0 and 0.9 Ma" (PDF). New Zealand Journal of Geology and Geophysics. 64 (2–3): 250–272. Bibcode:2021NZJGG..64..250P. doi:10.1080/00288306.2021.1915343. S2CID 235736318.