hawai‘i rocks (and minerals). oceanite (from mauna loa) – a basalt with >40% mafic...

HAWAI‘I ROCKS

(and minerals)

Oceanite (from Mauna Loa) – a basalt with >40% mafic phenocrysts, and all thephenocrysts are olivine.

olivine

Ankaramite (from Hualālai) – a basalt with >40% mafic phenocrysts, and those phenocrysts consist of olivine and pyroxene

olivine

pyroxene

Pyroxene crystals, weathered out of ankaramite lavas, East Maui SW rift zone

Outer, weathered surface of ankaramite from Rarotonga, Cook Islands

pyroxene

Freshly broken surface of ankaramite from Rarotonga, Cook Islands

pyroxene

olivine

amygdule(former vesicle, nowfilled with some sortof secondary mineral)

Vesicular basalt (from Kohala) with lots of little clusters of plagioclase feldspar phenocrysts (and a few olivine phenocrysts).

plagioclase feldspar

olivine

vesicle(frozen bubble)

Very fine-grained (almost glassy) basalt, from Wai‘anae

http://www.youtube.com/watch?v=fSPzMva9_CE

http://www.youtube.com/watch?v=lISK1YFcZBM

VIDEOS OF SUPER-COOLED WATER

Gabbro (from Wailau, Moloka‘i)plagioclase feldsparpyroxene

Granite (from Mojave desert, California)plagioclase feldspar

quartzpotassium feldspar

biotite, or maybe hornblende

Obsidian, from near Mono Lake, California

Pumice from Pu‘u Wa‘awa‘a, Hualālai

Calcareous sandstone (from near Ko Olina, O‘ahu)

Fragment of pāhoehoe lava showing the rapidly-chilled (and therefore glassy) outersurface, and the more slowly-cooled (and therefore crystalline) interior