Code: ML286
| 名稱 剛玉 | Name Corumdum |
| 化學公式 Al2O3 | Chemical Formula Al2O3 |
| 莫氏硬度 9 | Mohs scale of Hardness 9 |
| 描述 剛玉的顏色為無色，灰色，金棕色，棕色； 紫色，粉紅色至紅色，橙色，黃色，綠色，藍色，紫色； 可能是彩色區域，主要是灰色和棕色。他有白色的線條。光澤為金剛烷至玻璃質。剛玉是易碎。 | Description The color of corumdum is Colorless, gray, golden-brown, brown; purple, pink to red, orange, yellow, green, blue, violet; may be color zoned, asteriated mainly grey and brown. The streak is white. The luster is adamantine to vitreous. It is brittle. |
| 小挑戰 在正常生活中我們在哪裡可以看到它？ 我們可以從飾品中找到它。 還可以在砂紙和各種研磨設備中加工金屬，塑料和木材。 | Challenge Where can we see it in normal life? We can find it from the accessories. Also in sandpaper and various grinding equipment to process metal, plastic and wood. |
Reference
By 4A Lee York 22 on 17/4/2021