璇石 (Soān-chio̍h)是 (sī)炭 (thoàⁿ)的 (ê)1種 (chióng)形 (hêng),嘛 (mā)是天然 (thian-jiân)的材料裡 (châi-liāu--nih)上 (siāng)蓋 (kài)𠕇的 (tēng--ê)。璇石的𠕇度 (tēng-tō͘)懸 (koân),對 (tùi)光 (kng)的波線 (pho-soàⁿ) (dispersion) 閣 (koh)懸,予 (hō͘)伊 (i)佇 (tī)工業 (kang-gia̍p)抑 (ia̍h)珠寶 (chu-pó)攏 (lóng)真 (chin)有 (ū)路用 (lō͘-ēng)。