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I knew the formula for quartz... now I know feldspars. That counts for most of the Earth's crust - can I stop now?

(Grrr, you're making me wonder what is olivine exactly.)

en.wikipedia.org/wiki/Olivine
? TBD
Bluesky post by @johncarlosbaez.bsky.social
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John C. Baez
John C. Baez
@johncarlosbaez.bsky.social · 12d · Bluesky
Olivine - Wikipedia
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Olivine