Hsu Wen-hsiung points out that originally crystal referred to the naturally-occurring crystalline shapes of quartz. It appears colorless, transparent, and sparkling. Glass, on the other hand, is manufactured out of quartz sand, potassium carbonate, sodium carbonate, bauxite, or minium (red lead).
徐文雄指出，所謂水晶是一種天然的石英結晶體，看起來無色、透明、晶瑩剔透；玻璃則是人工以矽砂、碳酸鉀、碳酸鈉、鋁土、鉛丹…… 等原料燒製而成。