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Diverse Rocks and Minerals of Hawai‘i: An Exploration of Basalts, Olivine, and More

Discover the unique geology of Hawai‘i with rocks and minerals like olivine, pyroxene, and plagioclase feldspar found in various formations such as basalt, gabbro, and granite. Explore volcanic gems like obsidian, pumice, and calcareous sandstone, showcasing the dynamic natural history of the islands.

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Diverse Rocks and Minerals of Hawai‘i: An Exploration of Basalts, Olivine, and More

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  1. HAWAI‘I ROCKS (and minerals)

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

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

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

  5. pyroxene Outer, weathered surface of ankaramite from Rarotonga, Cook Islands

  6. olivine amygdule (former vesicle, now filled with some sort of secondary mineral) pyroxene Freshly broken surface of ankaramite from Rarotonga, Cook Islands

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

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

  9. plagioclase feldspar pyroxene Gabbro (from Wailau, Moloka‘i)

  10. potassium feldspar quartz plagioclase feldspar biotite, or maybe hornblende Granite (from Mojave desert, California)

  11. Obsidian, from near Mono Lake, California

  12. Pumice from Pu‘u Wa‘awa‘a, Hualālai

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

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

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