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Chemistry

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    $\begingroup$ I would consider titanium neither rare nor expensive. Titanium is ninth most abundant element on Earth, and is much cheaper than other transition metals used as catalysts. My friend used to ride a bicycle with titanium frame (aquired about 20 years ago) before switching to carbon fiber, and he is no Rockefeller. $\endgroup$
    – andselisk ♦
    Commented Oct 10, 2022 at 5:04
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    $\begingroup$ The only aspect somewhat affecting price is technologically demanding production of bulk metallic titanium, due its high affinity of oxygen and high melting point. $\endgroup$
    – Poutnik
    Commented Oct 10, 2022 at 8:00