hawai‘i rocks (and minerals). oceanite (from mauna loa) – a basalt with >40% mafic...
Post on 19-Dec-2015
212 views
TRANSCRIPT
![Page 1: HAWAI‘I ROCKS (and minerals). Oceanite (from Mauna Loa) – a basalt with >40% mafic phenocrysts, and all the phenocrysts are olivine. olivine](https://reader030.vdocuments.us/reader030/viewer/2022032800/56649d355503460f94a0cf10/html5/thumbnails/1.jpg)
HAWAI‘I ROCKS
(and minerals)
![Page 2: HAWAI‘I ROCKS (and minerals). Oceanite (from Mauna Loa) – a basalt with >40% mafic phenocrysts, and all the phenocrysts are olivine. olivine](https://reader030.vdocuments.us/reader030/viewer/2022032800/56649d355503460f94a0cf10/html5/thumbnails/2.jpg)
Oceanite (from Mauna Loa) – a basalt with >40% mafic phenocrysts, and all thephenocrysts are olivine.
olivine
![Page 3: HAWAI‘I ROCKS (and minerals). Oceanite (from Mauna Loa) – a basalt with >40% mafic phenocrysts, and all the phenocrysts are olivine. olivine](https://reader030.vdocuments.us/reader030/viewer/2022032800/56649d355503460f94a0cf10/html5/thumbnails/3.jpg)
Ankaramite (from Hualālai) – a basalt with >40% mafic phenocrysts, and those phenocrysts consist of olivine and pyroxene
olivine
pyroxene
![Page 4: HAWAI‘I ROCKS (and minerals). Oceanite (from Mauna Loa) – a basalt with >40% mafic phenocrysts, and all the phenocrysts are olivine. olivine](https://reader030.vdocuments.us/reader030/viewer/2022032800/56649d355503460f94a0cf10/html5/thumbnails/4.jpg)
Pyroxene crystals, weathered out of ankaramite lavas, East Maui SW rift zone
![Page 5: HAWAI‘I ROCKS (and minerals). Oceanite (from Mauna Loa) – a basalt with >40% mafic phenocrysts, and all the phenocrysts are olivine. olivine](https://reader030.vdocuments.us/reader030/viewer/2022032800/56649d355503460f94a0cf10/html5/thumbnails/5.jpg)
Outer, weathered surface of ankaramite from Rarotonga, Cook Islands
pyroxene
![Page 6: HAWAI‘I ROCKS (and minerals). Oceanite (from Mauna Loa) – a basalt with >40% mafic phenocrysts, and all the phenocrysts are olivine. olivine](https://reader030.vdocuments.us/reader030/viewer/2022032800/56649d355503460f94a0cf10/html5/thumbnails/6.jpg)
Freshly broken surface of ankaramite from Rarotonga, Cook Islands
pyroxene
olivine
amygdule(former vesicle, nowfilled with some sortof secondary mineral)
![Page 7: HAWAI‘I ROCKS (and minerals). Oceanite (from Mauna Loa) – a basalt with >40% mafic phenocrysts, and all the phenocrysts are olivine. olivine](https://reader030.vdocuments.us/reader030/viewer/2022032800/56649d355503460f94a0cf10/html5/thumbnails/7.jpg)
Vesicular basalt (from Kohala) with lots of little clusters of plagioclase feldspar phenocrysts (and a few olivine phenocrysts).
plagioclase feldspar
olivine
vesicle(frozen bubble)
![Page 8: HAWAI‘I ROCKS (and minerals). Oceanite (from Mauna Loa) – a basalt with >40% mafic phenocrysts, and all the phenocrysts are olivine. olivine](https://reader030.vdocuments.us/reader030/viewer/2022032800/56649d355503460f94a0cf10/html5/thumbnails/8.jpg)
Very fine-grained (almost glassy) basalt, from Wai‘anae
![Page 9: HAWAI‘I ROCKS (and minerals). Oceanite (from Mauna Loa) – a basalt with >40% mafic phenocrysts, and all the phenocrysts are olivine. olivine](https://reader030.vdocuments.us/reader030/viewer/2022032800/56649d355503460f94a0cf10/html5/thumbnails/9.jpg)
http://www.youtube.com/watch?v=fSPzMva9_CE
http://www.youtube.com/watch?v=lISK1YFcZBM
VIDEOS OF SUPER-COOLED WATER
![Page 10: HAWAI‘I ROCKS (and minerals). Oceanite (from Mauna Loa) – a basalt with >40% mafic phenocrysts, and all the phenocrysts are olivine. olivine](https://reader030.vdocuments.us/reader030/viewer/2022032800/56649d355503460f94a0cf10/html5/thumbnails/10.jpg)
Gabbro (from Wailau, Moloka‘i)plagioclase feldsparpyroxene
![Page 11: HAWAI‘I ROCKS (and minerals). Oceanite (from Mauna Loa) – a basalt with >40% mafic phenocrysts, and all the phenocrysts are olivine. olivine](https://reader030.vdocuments.us/reader030/viewer/2022032800/56649d355503460f94a0cf10/html5/thumbnails/11.jpg)
Granite (from Mojave desert, California)plagioclase feldspar
quartzpotassium feldspar
biotite, or maybe hornblende
![Page 12: HAWAI‘I ROCKS (and minerals). Oceanite (from Mauna Loa) – a basalt with >40% mafic phenocrysts, and all the phenocrysts are olivine. olivine](https://reader030.vdocuments.us/reader030/viewer/2022032800/56649d355503460f94a0cf10/html5/thumbnails/12.jpg)
Obsidian, from near Mono Lake, California
![Page 13: HAWAI‘I ROCKS (and minerals). Oceanite (from Mauna Loa) – a basalt with >40% mafic phenocrysts, and all the phenocrysts are olivine. olivine](https://reader030.vdocuments.us/reader030/viewer/2022032800/56649d355503460f94a0cf10/html5/thumbnails/13.jpg)
Pumice from Pu‘u Wa‘awa‘a, Hualālai
![Page 14: HAWAI‘I ROCKS (and minerals). Oceanite (from Mauna Loa) – a basalt with >40% mafic phenocrysts, and all the phenocrysts are olivine. olivine](https://reader030.vdocuments.us/reader030/viewer/2022032800/56649d355503460f94a0cf10/html5/thumbnails/14.jpg)
Calcareous sandstone (from near Ko Olina, O‘ahu)
![Page 15: HAWAI‘I ROCKS (and minerals). Oceanite (from Mauna Loa) – a basalt with >40% mafic phenocrysts, and all the phenocrysts are olivine. olivine](https://reader030.vdocuments.us/reader030/viewer/2022032800/56649d355503460f94a0cf10/html5/thumbnails/15.jpg)
Fragment of pāhoehoe lava showing the rapidly-chilled (and therefore glassy) outersurface, and the more slowly-cooled (and therefore crystalline) interior