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Another good article Richard. One minor typo though - "somewhere in a four-cornered phase diagram, with iron and **magnesium** on two opposite corners". At least you know I read it! 😆

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Oops! Thanks much, fixed.

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Well I was quite excited about a tiny octahedral crystal of BLACK magnetite in some precambrian schist above Loch Lomond. It deflected my compass needle! Also my wife is keen on black 🖤 flowers...

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