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The melting mechanism of Na 2 SiO 3 , a crystal with pyroxene structure, includes three distinct reactions. All are driven by heating with each reaction commencing at a different temperature. The first two reactions proceed within the crystal at temperatures well below the melting point and are expressed by distinctive crystallographic, calorimetric, and Raman spectroscopic changes to the crystal. With the reactions identified and explained for Na 2 SiO 3 (c) and the melting mechanism elucidated, the Na 2 SiO 3  system becomes the “Rosetta Stone” by which to decipher the melting mechanisms of all pyroxenes and other silicate minerals.

Melting, crystallization, and the glass transition: Toward a unified description for silicate phase transitions