Table 3: Activation energies of crystallization $E_{\rm a}/k$ determined for differently produced magnesium silicates.
Material Material properties $E_{\rm a}/k$ (K) Crystalline phase

Mg₂SiO₄ Smoke, inhomogeneous 39 100 forsterite

MgSiO₃ Smoke, inhomogeneous 42 040 forsterite, tridymite

MgSiO₃ Glas, homogeneous, grain sizes $\le$ 1 $\mu$ m 40 100-43 300

Mg_0.95Fe_0.05SiO₃ glass, homogeneous, grain sizes $\le$ 1 $\mu$ m 38 525 enstatite

Mg-silicate Sol-gel, homogeneous, Me-OH bondings 26 600-31 700

MgSiO₃ enstatite

Mg_1.5SiO_3.5 enstatite, forsterite

Mg_1.8SiO_3.8 dependent on forsterite

Mg₂SiO₄ Me-OH content forsterite

Mg_2.4SiO_4.4 forsterite

Mg_2.6SiO_4.6 forsterite, MgO

**Table 3:** Activation energies of crystallization $E_{\rm a}/k$ determined for differently produced magnesium silicates.
Material	Material properties	$E_{\rm a}/k$ (K)	Crystalline phase
Mg₂SiO₄	Smoke, inhomogeneous	39 100	forsterite
MgSiO₃	Smoke, inhomogeneous	42 040	forsterite, tridymite
MgSiO₃	Glas, homogeneous, grain sizes $\le$ 1 $\mu$ m	40 100-43 300
Mg_0.95Fe_0.05SiO₃	glass, homogeneous, grain sizes $\le$ 1 $\mu$ m	38 525	enstatite
Mg-silicate	Sol-gel, homogeneous, Me-OH bondings	26 600-31 700
MgSiO₃			enstatite
Mg_1.5SiO_3.5			enstatite, forsterite
Mg_1.8SiO_3.8		dependent on	forsterite
Mg₂SiO₄		Me-OH content	forsterite
Mg_2.4SiO_4.4			forsterite
Mg_2.6SiO_4.6			forsterite, MgO

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