Tn̂g-chio̍h
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Tn̂g-chio̍h (Hàn-jī: 長石; Eng-gí: feldspar) sī chi̍t chióng chō-gâm khòng-bu̍t ê cho̍k-kûn, sio̍k-tī ko͘-á ke-sng-iâm khòng-bu̍t, sêng-hūn ū a-lú-mih, koh ū pau-hâm sodium, calcium, potassium ia̍h-sī barium.[1] The most common members of the feldspar group are the plagioclase (sodium-calcium) tn̂g-chio̍h kap alkali (potassium-sodium) tn̂g-chio̍h.[2] Tē-khak liōng-iok ū 60% lóng sī tn̂g-chio̍h,[1] tē-kiû ê tāi-lio̍k tē-khak mā ū 41% ê tāng-liōng sī tn̂g-chio̍h.[3][4]