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Earth and Space Sciences · 术语表

什么是 Aluminosilicate polymorphs？

Definition 10.6 University Earth and Space Sciences — Year 2 · 第 10 章 — Metamorphic Reactions and Facies

The aluminosilicate polymorphs are the three minerals of formula $\ce{Al2SiO5}$ : kyanite (triclinic), andalusite and sillimanite (both orthorhombic).

	$\Delta_f H^\circ$ ( $\mathrm{kJ}\,\mathrm{mol}^{-1}$ )	$S^\circ$ ( $\mathrm{J}\,\mathrm{mol}^{-1}\,\mathrm{K}^{-1}$ )	$V^\circ$ ( $\mathrm{J}\,\mathrm{bar}^{-1}$ )	density ( $\mathrm{g}\,\mathrm{cm}^{-3}$ )
kyanite	$-2593.8$	82.80	4.415	3.670
andalusite	$-2589.9$	91.39	5.152	3.145
sillimanite	$-2586.1$	95.40	4.986	3.250

Kyanite, andalusite and sillimanite at

298.15\,\mathrm{K}

and

1\,\mathrm{bar}

(Robie and Hemingway, 1995); the enthalpies are uncertain by

2.0\,\mathrm{kJ}\,\mathrm{mol}^{-1}

, the entropies by 0.5. Density from the molar mass,

162.046\,\mathrm{g}\,\mathrm{mol}^{-1}

, and the volume.

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