kalsilite

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Figure 15: Melting relations among minerals in the system SiO2 (quartz)–KAlSiO4 (kalsilite)–Mg2SiO4 (forsterite). Temperatures next to compositions refer to the melting points of those compositions in °C. Protoenstatite, instead of enstatite, is produced in experiments of this type. The compositions of protoenstatite and enstatite are identical, but their structures differ.

kalsilite

mineral

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variety of nepheline

In nepheline
… is the high-temperature form of kalsilite, the potassium-rich variety of nepheline. Kaliophilite is unstable at normal temperatures and rarely occurs in nature.
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