Exsolution|出溶:高溫時均一的一顆礦物,冷卻後能在自己內部分家成兩相
WHAT 這是什麼
Exsolution occurs when a mineral solid solution that was homogeneous at higher temperature becomes unstable during cooling and separates into two compositions while remaining solid. Common examples include perthitic feldspar, where plagioclase-rich lamellae separate within K-feldspar, and exsolution textures in pyroxenes.
WHY HERE 為什麼屬於底域的世界
它讓一顆晶體的內部變成冷卻紀錄:現在看見的兩相紋理,可能原本曾經是一個均勻晶格,直到溫度下降才開始「分家」。
BLIND SPOT 補了哪一塊少看的視角
出溶需要特定成分範圍與冷卻條件;礦物內的條紋或片狀構造也可能有其他成因,不能只靠外觀判定。