Code: ML277
| 名稱 蛋白石 | Name Boulder Opal |
| 化學公式 SiO2 | Chemical Formula SiO2 |
| 莫氏硬度 5.5-6.5 | Mohs scale of Hardness 5.5-6.5 |
| 描述 蛋白石是非晶質結構，無一定外形，斷口為貝殼狀，主要是二氧化矽的膠體沉澱形成的，如果沉澱在生物遺骸中，則形成「樹化玉」。 | Description Opal has an amorphous structure, without a certain shape, and the fracture is shell-shaped. It is mainly formed by the precipitation of colloidal silica. If it is deposited in biological remains, it will form “tree-like jade.” |
| 小挑戰 我們在哪裡可以找到這石頭？ 澳洲 | Challenge Where can we find this stone? Australia |
Reference
https://zh.wikipedia.org/wiki/%E8%9B%8B%E7%99%BD%E7%9F%B3
by Ho Yat Nga on 18 April 2021