[Rockhounds] Aquamarine

[J Bryan Kramer]

Article on the formation of aquamarine:
<https://blogs.scientificamerican.com/rosetta-stones/aquamarine-a-neptunian-stones-plutonic-origin-story/>

BK

“The problem isn’t that Johnny can’t read. The problem isn’t even that
Johnny can’t think. The problem is that Johnny doesn’t know what
thinking is; he confuses it with feeling.”

Thomas Sowell

J Bryan Krämer       North Florida, USA
photos at: http://pbase.com/photoburner

On Fri, Mar 29, 2019 at 7:34 PM Tim Fisher <nospam at orerockon.com> wrote:
>
> And this one, much more in depth:
> https://www.newyorker.com/magazine/2019/04/08/the-day-the-dinosaurs-died?utm_campaign=aud-dev&utm_source=nl&utm_brand=tny&utm_mailing=TNY_Daily_032919&utm_medium=email&bxid=5bd670422ddf9c619438b5a1&user_id=24445663&esrc&utm_term=TNY_Daily
>
>
> -----Original Message-----
> From: Rockhounds [mailto:rockhounds-bounces at rockhounds.drizzle.com] On Behalf Of Kreigh Tomaszewski
> Sent: Friday, March 29, 2019 1:17 PM
> To: Rockhounds at drizzle.com: A mailing list for rock and gem collectors
> Subject: [Rockhounds] 66-million-year-old deathbed linked to dinosaur-killing meteor
>
> The beginning of the end started with violent shaking that raised giant waves in the waters of an inland sea in what is now North Dakota.
>
> Then, tiny glass beads began to fall like birdshot from the heavens. The rain of glass was so heavy it may have set fire to much of the vegetation on land. In the water, fish struggled to breathe as the beads clogged their gills.
>
> The heaving sea turned into a 30-foot wall of water when it reached the mouth of a river, tossing hundreds, if not thousands, of fresh-water fish—sturgeon and paddlefish—onto a sand bar and temporarily reversing the flow of the river. Stranded by the receding water, the fish were pelted by glass beads up to 5 millimeters in diameter, some burying themselves inches deep in the mud. The torrent of rocks, like fine sand, and small glass beads continued for another 10 to 20 minutes before a second large wave inundated the shore and covered the fish with gravel, sand and fine sediment, sealing them from the world for 66 million years.
>
> https://phys.org/news/2019-03-million-year-old-deathbed-linked-dinosaur-killing-meteor.html
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