Jeff
likelyactinolite.bsky.social
Jeff
@likelyactinolite.bsky.social
Graduate Gemologist, B.S. in Earth Sciences, minerals and rocks ❤️
Reposted by Jeff
Pineapple opal—also known as ananas opal—is an exceptionally rare variety of precious opal found exclusively in the White Cliffs region of New South Wales, Australia.
#opal #gems
www.geologyin.com/2016/08/gorg...
Pineapple Opal – Geology In
Pineapple opal —also known as ananas opal —is an exceptionally rare variety of precious opal found exclusively in the White Cliffs regi...
www.geologyin.com
September 8, 2025 at 5:15 PM
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Stunning sky + stunning geologic formations = #Stunday
Panorama Trail in Kodachrome Basin State Park, #Utah
#photography #hiking #geology #rocks
September 14, 2025 at 12:51 PM
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252 of #365Minerals 🧪⚒️

Opal:
- Hydrated form of silica
- A mineraloid (has an amorphous structure)
- Consists of silica spheres which diffract light, producing a rainbow effect
- Wood can become opalised during fossilisation
- Its name likely comes from the Sanskrit "उपल/upala" (stone) #minerals
September 9, 2025 at 9:54 AM
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It's #WaterfallWednesday so here's one of the iconic #Iceland waterfalls: Svartifoss, flowing over a cliff of columnar basalt. #photography #waterfalls #geology.
September 10, 2025 at 12:17 PM
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'Californian Morning' (mid 20thc) by US artist and printmaker Emmy Lou Packard (1914-1998) #WomensArt
August 10, 2025 at 12:49 PM
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Watermelon Tourmaline is a lithium-rich tourmaline mineral, characterized by its notable concentric color zoning. This zoning typically consists of a pink or red core, colored by manganese, surrounded by a green outer rim, colored by iron or chromium.
www.geologyin.com/2021/07/wate...
What is Watermelon Tourmaline (Photos) – Geology In
Watermelon Tourmaline is a distinct variety of elbaite , a lithium-rich tourmaline mineral, characterized by its notable concentric color ...
www.geologyin.com
June 12, 2025 at 7:43 PM
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The earliest evidence for life is a 4.1 billion years old zircon crystal grain with encased graphite sporting a high carbon ¹²C/¹³C isotope ratio. Life preferentially uses the lighter ¹²C atom in biological processes. #Science #Biology #Geology 🧪

See: doi.org/10.1073%2Fpn...
June 1, 2025 at 2:17 PM
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For geologists: I remember reading Russian geology papers and maps in the early 90s, and being struck by the absence of plate tectonics. It wasn't accepted in Soviet Russia.

(I would love to see a historian of science talk about the rejection of plate tectonics in the Soviet Union.)
There are 2 previous historical cases of countries destroying their science and universities, crippling them for decades: Lysenkoism in the USSR and Nazi Germany. The Trump administration will be the 3rd.
It's not just budgets but research, institutions, expertise, and training the next generation.
May 31, 2025 at 1:53 PM
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Incredible Double Sided Pattern Koroit Boulder Opal.

Photo ©️ Wild.Opals
#OPAL
May 26, 2025 at 4:14 PM
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Natural Welo Opal Raw, from Ethiopia

Photo by: BigStargems

#opal #gems
May 17, 2025 at 4:27 PM
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Matrix opal refers to opal that formed pervasively within the structure of its host rock. It fills the pores, voids, or spaces between the grains of this surrounding rock—typically called the matrix.

Photo by: Brisbane Opal Museum
#opal
May 12, 2025 at 4:51 PM
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A colleague emailed me today to flag the fact that the superb Fourth Circuit Judge J. Harvie Wilkinson ended a quotidian insurance opinion with an unusually introspective conclusion.
April 24, 2025 at 2:47 PM
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Two unrelated postcards in my collection that tell a story together. 🤕
April 15, 2025 at 1:19 AM
January 5, 2025 at 4:37 AM
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Geology of Katsurajima Island (Dike)
#Japan #geology #photography #outcrop

Katsurajima Island in Shimane Town, Matsue City, Shimane Prefecture, Japan, is known for its geology formed by andesitic to rhyolitic lava that erupted underwater about 15 million years ago (Middle Miocene epoch).
December 6, 2024 at 5:33 PM
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A Jurassic (151.5 million year old) sphenodont in Solnhofen limestone. Sphenodonts are lizard-like reptiles. When I saw this specimen back in mid 2017, its label said it was an undescribed new species

On display in the Bürgermeister-Müller-Museum in Germany
#fossils #geology #FossilFriday ⚒️🧪
December 6, 2024 at 12:19 PM
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A neat section of the seaside cliffs at my home town. Newfoundland, Canada.
#rocks #cliffs #geology #art
December 3, 2024 at 12:44 PM
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One of my favourite things to do when I’m exploring the boreal is to examine the different geological features on the Canadian shield. The rocks are fascinating. I like looking at glacial erratics which have been transported here from elsewhere. #geomorphology #geology #nature #canada #rocks
December 4, 2024 at 4:08 AM
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Always wanted to visit the Black Canyon of the Gunnison National Park. The painted wall didn’t not disappoint! #blackcanyonofthegunnison #nationalparks #colorado #paintedwall #photography #blackcanyon #Gunnison #landscapephotography
November 22, 2024 at 3:26 AM
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📍Zion National Park, Utah ⛰️
Snow covered mountains in one of my favorite parks.🔥
#travel #explore #photography #zion #nationalparks #utah

📸 Alex Moliski
November 24, 2024 at 11:14 PM
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November 26, 2024 at 1:56 AM