Capable of forming, producing, or causing the formation of a crust; tending to create a crusty surface.
From crust (Latin crusta) plus the suffix -fic (from Latin -ficus meaning 'making' or 'producing'). It describes something that causes crust formation.
Some minerals are crustific—they naturally form hard crystalline crusts on cave walls and rock surfaces as water carrying dissolved minerals evaporates, creating the glittering formations you see in caves.
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