Japanese pronunciation: せっかい (sekkai)
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White lumps burnt from calcite. Worked together with straw it becomes shikkui plaster.
Obtaining
Usage
As an ingredient
Behavior
Burning calcite
Calcite is calcium carbonate, and burning is what turns it into lime. Raw calcite mixed with straw sets into nothing, so the firing cannot be skipped. Look for calcite around amethyst geodes.