Can a valid syllogism be fallacious?

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Can a valid syllogism be fallacious? For example God can speak Mandarin. Charity is God. ∴ Charity can speak Mandarin. David can speak Tagalog. David's bones are David. ∴ David's bones can speak Tagalog. I'm pretty sure these are valid but unsound syllogisms, and I think they both commit the fallacy of division, but if the premises were true, would the conclusion also be true? I thought of an analogous syllogism that's sound, and I just can't figure this puzzler out. Basalt is rock. Rock is natural. ∴ Basalt is natural.