[ExI] not that rare earth (part 2 of at least 2)

[John Clark]

On Mon, Nov 3, 2025 at 2:19 PM <spike at rainier66.com> wrote:


>> *>> Even the phone in your pocket would be larger and heavier than it is
>> now without rare earth metals.  *
>
>
>
*> John I find that notion most implausible.  A phone has a very small
> speaker which would contain magnets.*


*A very small speaker that, considering how tiny it is, sounds amazingly
good thanks to rare earth magnets. Also, you can thank rare earth magnets
for the haptic vibration feedback that all modern phones have. And Europium
displays the red hues you see on your screen and Yttrium produces the
green. And although Indium isn't a rare earth it is a rare metal, and
almost all of it comes from, you guessed it, China. And without Indium you
wouldn't have a touch sensitive screen because Indium Tin Oxide is one of
the very few solid substances that is both electrically conductive and
optically transparent. *


*John K Clark*
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