**Table 1:** Mean size and material composition of dust grains.
Local	Mean grain	Material
temperature	size	composition
T [K]	$\langle a \rangle$ [ $\mu$ m]	[volume frac.]
$\lesssim$ 1000	$10^{-2}~\ldots~10^{-1}$	$25 {- }35\%$ SiO₂[s]
		$20 {-} 25\%$ Mg₂SiO₄[s]
		$10 {-} 25\%$ MgSiO₃[s]
		$15\%$ Fe[s], $10\%$ MgO[s]
$1000~\ldots~ 1700$	$10^{-1}~\ldots~30$	$25 {- }30\%$ Mg₂SiO₄[s]
		$20 {-} 30\%$ MgSiO₃[s] & SiO₂[s]
		$15\%$ Fe[s], $10\%$ MgO[s]
$1700~\ldots~2000$	$30~\ldots~200$	strongly changing composition
$2000~\ldots~2300$	$200~\ldots~300$	$80\%$ Fe[s], $\sim$ 18% Al₂O₃

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