No, it consumes olivine dust; it doesn't produce it. Olivine dust is full of potentially toxic metals, but as long as you aren't inhaling it, you don't have to worry about them. Olivine isn't water-soluble.

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idontwantthis 3 days ago | parent [-]

I mean that it leaves us with the co2 absorbing part already ground up with metals removed.

	▲	kragen 2 days ago \| parent [-]
		Aren't the metals the CO₂-absorbing part? Olivine is the fayalite–forsterite–tephroite continuum. Fayalite is Fe₂SiO₄. Forsterite is Mg₂SiO₄. Tephroite is Mn₂SiO₄. (Admittedly, as metals go, those aren't very toxic.) If you remove the metals from olivine what's left over is silica. Like, quartz. It doesn't absorb CO₂.