I'll try Hafnium, found in Zircon.

On Fri, 1 Jul 2011 07:07:51 -0500, David D. Hillman <[log in to unmask]> wrote:

>Hi folks - Here is the Friday Element Quiz Question:
>
>The Question:
>
>This element is used for research purposes only. There are no commercial
>outlets for the element as Sodium can be used to accomplish the same tasks
>at a much lower cost. This element is more expensive than gold or platinum
>(*** per my reference source). A pure sample of this element was not
>produced until 1928. Apples contain 50 ppm of this element but plays has
>no known biological role.
>
>Bonus Question: Name the mineral that contains this element.
>
>

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