**Table 5:** Characteristic quantities and numerical coefficients used for calculating grain destruction and grain growth (SiC does not form in the ISM).
	Silicates	Carbon	Iron	SiC
$\tau_{j,\rm SNR}$ (Gyr)	0.4	0.6	0.6	0.6
$\eta_{\rm SN~II}$	0.00035	0.15	0.001	0.0003
$\eta_{\rm SN~Ia}$	0.0	0.0	0.005	0.0
key element	Si or Mg	C	Fe	Si
Atomic weight A	121.41	12.01	55.85
bulk density $\rho_{\rm c}$ (g cm^-3)	3.13	2.25	7.86

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