iiinova — where your digital self keeps evolving

Sean David @vaccinium-sultan.bsky.social · 20/02/2026

Garnetite enclave in garnet clinpyroxenite mantle xenolith Oʻahu, Hawaiʻi #pyroxenite #geology #xenolith #hawaii #volcanology #garnet #garnetite #geoscience

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Sean David @vaccinium-sultan.bsky.social · 20/02/2026

Garnetite enclave in garnet clinopyroxenite mantle xenolith Oʻahu, Hawaiʻi #pyroxenite #geology #xenolith #hawaii #volcanology #garnet #garnetite #geoscience

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Sean David @vaccinium-sultan.bsky.social · 15/02/2026

Dunite and troctolite xenoliths hosted by hawaiitevand closeup of dunite olivines Laupāhoehoe Volcanics, Mauna kea #geology #geoscience #volcano #hawaii #maunakea #xenolith #peridotite #dunite #troctolite #olivine

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Sean David @vaccinium-sultan.bsky.social · 14/02/2026

Kailua Member of the Koʻolau Basalt Secondary minerals including opal, cristobalite, and epidotized plagioclase glomerocrysts #geology #geoscience #hawaii #metamorphism #epidote #plagioclase #quartz #Basalt #opal

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Sean David @vaccinium-sultan.bsky.social · 12/02/2026

Select olivine sands (one ʻōmaʻo) formed from olivine weathered out of tuffs of Honolulu Volcanics tuff rings and cones on Oʻahu. #geology #geoscience #sand #olivine #mineral #hawaii #olivinesand

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Sean David @vaccinium-sultan.bsky.social · 06/02/2026

Plagioclase and spinel peridotites of mantle and crustal origin hosted by basanite One of the three Nuʻuanu flows (~600 ka), Honolulu Volcanics, Koʻolau, #peridotite #xenolith #geology #geoscience #volcano #Hawaii

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Sean David @vaccinium-sultan.bsky.social · 14/01/2026

Chrome diopside vein in peridotite mantle xenolith. San Carlos Volcanic Field, San Carlos Apache Reservation, Arizona #peridotite #xenolith #lherzolite #geology #geoscience #chromediopside #pyroxene #clinopyroxene #Volcano

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Sean David @vaccinium-sultan.bsky.social · 15/12/2025

Harzburgite Blue Ridge Ophiolite, North Carolina From a now inactive extremely slow-moving spreading center. #geology #geoscience #peridotite #harzburgite #olivine #orthopyroxene #mantle #Ophiolite

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Sean David @vaccinium-sultan.bsky.social · 04/12/2025

Is this xenolith an orthopyroxene-bearing troctolite or a plagioclase-bearing olivine websterite? 😭 I'll have to not forgot my loupe again when back in January. Kaʻūpūlehu Flow Field, Hualālai Volcanics, Hualālai, Hawaiʻi #xenolith #mafic #ultramafic #troctolite #websterite #geoscience #geology

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Sean David @vaccinium-sultan.bsky.social · 02/12/2025

Revisiting this Honolulu Volcanics mantle xenolith which has a porphyroclastic texture. Note the bimodal grain size distribution of the olivines with large subhedral porphyroclasts and smaller relatively euhedral neoblasts in the matrix. #xenolith #peridotite #geology ##geoscience #olivine

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Sean David @vaccinium-sultan.bsky.social · 30/11/2025

Dunite xenoliths in picrite, Koʻolau. Due to their high density and low viscosity, picrites are the only tholeiitic melts that can carry ultramafic xenoliths to the surface. In Hawaiʻi, these are usually crustal cumulates of tholeiitic affinity. #xenolith #dunite #geology #geoscience #picrite

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Sean David @vaccinium-sultan.bsky.social · 21/11/2025

Back on Oʻahu and Big Island in late January and super excited to get to (re)visit mantle and crustal xenoliths of the Koʻolau Honolulu Volcanics as well as those of Hualālai, Mauna Kea, and unusual Mauna Loa ultramafic mantle xenoliths hosted by tholeiitic basalt. #xenolith #peridotite #geology

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Sean David @vaccinium-sultan.bsky.social · 19/11/2025

Extrapolating on heavily argillized rhyolites cut by pebble and andesite dikes. Packard Quartz Latite (35.27 ± 0.03 ma) East Tintic Mountains, Utah #geology #geoscience #rhyolite #pebbledikes

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Sean David @vaccinium-sultan.bsky.social · 17/11/2025

Kilbourne Hole peridotite mantle xenolith with area of dark orthopyroxene crystals formed via the rock-melt reaction MG2Si04 + Si02 → 2MgSi03. Part of a complex history involving rock-melt interaction, refertilization, and multiple metasomatic events. #xenolith #peridotite #pyroxene #orthopyroxene

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Sean David @vaccinium-sultan.bsky.social · 14/11/2025

Metasomatism is one of my least favorite things, but at least the classic propylitic alteration mineral assemblage involving chloritization and epidotization yields a rather aesthetic look. (Quartz?) monzonite Silver City Stock (Oligocene) Tintic Mountains,Utah #metasomatism #geology #geoscience

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Sean David @vaccinium-sultan.bsky.social · 12/11/2025

Towards the edge of a possible caldera Twin Peaks Subfield, Black Rock Desert Volcanic Field, Utah #Obsidian #rhyolite #volcanism #geology #geoscience #volcanicglass

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Sean David @vaccinium-sultan.bsky.social · 09/11/2025

Some silica-rich eruptive products of the Twin Peaks Subfield, Black Rock Desert Volcanic Field, Utah #Obsidian #rhyolite #volcanism #geology #geoscience #volcanicglass

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Sean David @vaccinium-sultan.bsky.social · 09/11/2025

Mahogany + snowflake obsidian Twin Peaks Subfield, Black Rock Desert Volcanic Field, Utah #Obsidian #rhyolite #volcanism #geology #geoscience #volcanicglass

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Sean David @vaccinium-sultan.bsky.social · 06/11/2025

Retrograde eclogite imprinted with blueschist facies minerals including phengite (golden flakey mineral), actinolite (black needles), and glaucophane (blue). Franciscan Complex, California #eclogite #blueschist #metamorphism #geology #geoscience #glaucophane #mica #amphibole

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Sean David @vaccinium-sultan.bsky.social · 03/11/2025

Oligocene rhyolite cut by andesite and pebble dikes. Extensive argillization and limonite staining. Initially identified as a quartz latite, the Packard Quartz Latite (35.27 ± 0.03 ma) plots as a subalkaline rhyolite. East Tintic Mountains, Utah #geology #geoscience #rhyolite #pebbledikes

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Sean David @vaccinium-sultan.bsky.social · 01/11/2025

Topaz Sherry colored freshly collected crystals and one in matrix that has been exposed to the sun. Thomas Mountains, Utah #topaz #geology #geoscience #rhyolite #mineral #utah

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Sean David @vaccinium-sultan.bsky.social · 26/10/2025

So excited to be back here in a week! Topaz Thomas Mountains, Utah #topaz #geology #geoscience #rhyolite #mineral

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Sean David @vaccinium-sultan.bsky.social · 25/10/2025

Spinel lherzolite mantle xenolith hosted by phonotephrite (collected with permission) San Carlos Volcanic Field, San Carlos Apache Reservation, Arizona #peridotite #xenolith #lherzolite #geology #geoscience #volcano

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Sean David @vaccinium-sultan.bsky.social · 20/10/2025

In things that make me happy, a bit of the collection...Lawsonite blueschist, eclogitic blueschist, glaucophanite, various eclogites, orthopyroxenite, clinopyroxenite, garnet websterite #eclogite #pyroxenite #blueschist #clinopyroxenite #websterite #garnet #metamorphic #geology #geoscience

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Sean David @vaccinium-sultan.bsky.social · 19/10/2025

Olivine is my second fav mineral after pyropic garnet and am super loving this forsteritic olivine ring. Peridotite xenolith in phonotephrite is from the classic location of the San Carlos volcanic field. #olivine #xenolith #peridotite

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Sean David @vaccinium-sultan.bsky.social · 18/10/2025

My hometown in the Koʻolau Caldera. Kailua Member of the Koʻolau Basalt and a dike of (likely) basaltic andesite. Reference location is super close to here. I recieved a grant that will cover next semester (that unfortunately has to be spent at a Utah university) but would rather be back here.

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Sean David @vaccinium-sultan.bsky.social · 11/10/2025

End of a hike over the subaerial Koko Rift from Hanauma to Kaupō. A sweatiest me standing on Kaupō flow (basanite) with Makapuʻu (tholeiitic picrites-basaltic andesite) rising behind. Olivine is the only phenocryst of Kaupō which have some of the highest MgO on the Koko Rift. #geology #geoscience

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Sean David @vaccinium-sultan.bsky.social · 10/10/2025

Widespread Laumontite precipitated in vesicles of the Kailua Member of the Koʻolau Basalt indicate circulating hydrothermal fluids here were around 300° C (Zeolite Facies). Kailua, Koʻolau, Oʻahu #geology #geoscience #zeolite #volcano #hydrothermal #amygdule #metamorphism

Lots of Laumontite (zeolite) crystals precipitated in vesicles from circulating hydrothermal fluids in the Koʻolau Caldera (Kailua Member 9fnthe Koʻolau Basalt)

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Sean David @vaccinium-sultan.bsky.social · 07/10/2025

Muffins made with ʻŌhelo ʻai (Vaccinium reticulatum,V. peleanum), endemics of east Maui and Hawaiʻi Island and a close relative of the salmonberry (Rubus spectabilis) with the largest fruit in the genus, ʻĀkala (Rubus hawaiensis). #botany #plantscience #rubus #vaccinium #plants #baking #hawaii

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Sean David @vaccinium-sultan.bsky.social · 07/10/2025

Spinel peridotite mantle xenolith and accidental fragment of Koʻolau. Basalt (note the plag phenocrysts) hosted in melilite nephelinite tuff. Moanalua vent, Honolulu Volcanics, Koʻolau, Oʻahu, Hawaiʻi #geoscience #geology #volcanology #volcano #mantle #xenolith #spinel #peridotite #Hawaii

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Sean David @vaccinium-sultan.bsky.social · 05/10/2025

Makapuʻu-Stage #Koʻolau Basalt has the most radiogenic Sr87/86 of #Hawaiʻi #lavas, low εNd, Hf176/177, and Pb206/204, and high La/Nb and Sr/Nb indicating a filament of recycled material (secondary garnet #pyroxenite via #eclogite) of the Hawaiian ULVZ associated with the Pacific LLSVP. #geology

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Sean David @vaccinium-sultan.bsky.social · 05/10/2025

Blowholes formed via caves eroded into expansive late shield-stage Koʻolau lavas ranging from picrites to basaltic andesite. Makapuʻu-stage Koʻolau Basalt Koʻolau, Oʻahu #blowhole #ocean #hawaii #Basalt #geology

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Sean David @vaccinium-sultan.bsky.social · 29/09/2025

Peridotite mantle xenolith hosted by basanite Nuʻuanu Pali vent (640-600 ka), Honolulu Volcanics, Koʻolau, Oʻahu, Hawaiʻi Collection of @volcanoesinthesea.bsky.social #peridotite #xenolith #geology #geoscience #volcano

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Sean David @vaccinium-sultan.bsky.social · 27/09/2025

Not a rock or mineral but a me training for #rugby pic....hopefully will translate into the ability to also carry so many mantle and crustal xenoliths.

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Sean David @vaccinium-sultan.bsky.social · 25/09/2025

One of several #basanite lava flows erupted from Kohelepelepe. Here it outcrops on #tuff emplaced via pyroclastic density currents. Kohelepelepe, Koko Rift, Honolulu Volcanics, Koʻolau

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Sean David @vaccinium-sultan.bsky.social · 07/09/2025

Looks like 10 of the samples are from Mahinui in the vicinity of my hometown, almost all are basaltic andesite and geochemically and isotopically very much Makapuʻu-stage 👀

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Sean David @vaccinium-sultan.bsky.social · 06/09/2025

Day at the Alta Stock contact aureole #Grossular #garnets #Diopside (any idea what the little yellow minerals are? I so want to believe they are either the metamorphic or metasomatic #forsterite that I've been looking for over the last 2 years) #contactmetamorphism #geoscience #geology #altastock

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Sean David @vaccinium-sultan.bsky.social · 01/09/2025

Olivine websterite (?) xenolith A recent study suggests a mantle origin for olivines in cumulate ultramafic xenoliths of Hualālai's Kaʻūpūlehu Flow Field. #geoscience #geology #hualālai #volcanology #volcano #xenolith #xenolith #websterite #pyroxenite

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Sean David @vaccinium-sultan.bsky.social · 25/08/2025

Everything about this is giving accidental fragment of Koʻolau basalt...the olivine texture, matrix, vesicularity...except there appear to also be phenocrysts of augite which are extremely rare for Hawaiian tholeiites and especially for Koʻolau Basalt. 🤔 Kohelepelepe, Honolulu Volcanics

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Sean David @vaccinium-sultan.bsky.social · 21/08/2025

Peridotite and clinopyroxenite mantle xenoliths Moanalua vent, Honolulu Volcanics, Koʻolau, Oʻahu, Hawaiʻi #geoscience #geology #dunite #volcanology #volcano #mantle #xenolith #xenocryst #peridotite #Hawaii #pyroxenite

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Sean David @vaccinium-sultan.bsky.social · 20/08/2025

Chromian pyrope garnets eroded from garnet pyroxenite (sensu lato) and/or garnet peridotite mantle xenoliths brought up by minette lamprophyres. Navajo Volcanic Field, Arizona #geology #geoscience #lamprophyre #garnet #pyrope #pyroxenite #eclogite #peridotite

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Sean David @vaccinium-sultan.bsky.social · 15/08/2025

Youngest vents of the Honolulu Volcanics. This part of the Koko Rift is marked by low MgO and higher SiO2, some samples plotting as evolved as hawaiite, reflecting a complex history of multiple magma mixing events and magma storage. #volcanism #volcano #lava #geology #geoscience #hawaii #hawaiʻi

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Sean David @vaccinium-sultan.bsky.social · 07/08/2025

Strange #clinopyroxenite mantle #xenolith hosted by rejuvenation-stage #Kauaʻi Kōloa Volcanics nephelinite(?). Unlike Oʻahu Honolulu Volcanics lavas for which carbonatite metasomatism in their petrogenesis is debatable, evidence is more robust for Kōloa. #pyroxenite #volcano #geology #geoscience

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Sean David @vaccinium-sultan.bsky.social · 03/08/2025

Clinopyroxenite and dunite xenoliths Kolekole Member of the Waiʻanae Volcanics Waiʻanae, Oʻahu #xenolith #clinopyroxenite #pyroxenite #volcano #geology #geoscience #dunite #peridotite

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