| 名稱 瑪瑙 | Name Agate |
| 化學公式 SiO2 | Chemical Formula SiO2 |
| 莫氏硬度 7 | Mohs scale of Hardness 7 |
| 描述 瑪瑙是半透明的微晶石英。當它具有理想的質量和顏色時，它可以用作半寶石。瑪瑙有多種顏色，包括棕色，白色，紅色，灰色，粉紅色，黑色和黃色。顏色是由雜質引起的，並以瑪瑙內的交替帶出現。 | Description Agate is a translucent variety of microcrystalline quartz. It is used as a semiprecious stone when it is of desirable quality and color. Agate occurs in a wide range of colors, which include brown, white, red, gray, pink, black, and yellow. The colors are caused by impurities and occur as alternating bands within the agate. |
| 小挑戰 瑪瑙是如何形成的？瑪瑙通常是由火成岩腔中地下水中的二氧化矽沉積而成的。瑪瑙沉積在空腔壁周圍的同心層中，或沉積在空腔底部的水平層中。 | Challenge How are Agate formed? Agate generally forms by the deposition of silica from groundwater in the cavities of igneous rocks. The agate deposits in concentric layers around the walls of the cavity, or in horizontal layers building up from the bottom of the cavity. |
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