名稱   瑪腦	Name   Thunderegg Agate Creek
化學公式   SiO2	Chemical Formula   SiO2
莫氏硬度   7	Mohs scale of Hardness   7
描述   瑪腦是一種結節狀的石頭，類似於玉石。它們的大小可以由一公分至一米不等。它們的中心通常擁有玉髓。從外表來看，它們就如普通石頭一樣沒有差異，但是把它們切開一半後就會知道裏面錯中複雜的紋路和顏色。	Description   Thunderegg is a nodule-like rock,similar to a filled geode.Their sizse can range from a little more than centimeter to over a meter across.They usually contain centers of chalcedony.They look like normal rocks on the outside,but you may reveal the intricate patterns and colors.
小挑戰 我們可以在哪裏抓到瑪腦？ 流紋岩漿	Challenge Where can we find Thunderegg Agate Creek? Rhyolite lava

Reference

1.https://en.m.wikipeida.org/wiki/Thunderegg

By 4A Ho Tsz Wing 12 on 19/4/2021