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fusibles and refractories

Fusibles are rocks or minerals that melt easily, and are the opposite of melting-resistant refractories.

Sedimentary rocks, which are stable at the Earth's cool surface, tend to be fusible because they consist mostly of stable minerals that have resisted weathering. Crystalline rocks tend to be refractory and to resist melting because they consist mostly of minerals that crystallized out of melts. The most refractory rocks, such as gabbro and peridotite, are stable in the lower crust and the mantle.

Bowen's Reaction Series

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