Gneiss has alternate bands of light and dark minerals and can form from a variety of different rocks.

片麻岩具有交替的浅色和深色 矿物带，可以由各种不同的岩石形成。

" Coal" (coal) is a hard, dark mineral that people can take out of the earth and burn to make heat thand energy.

“煤”（煤炭）是一种坚硬、黑色的矿物，人们可以从地下取出并燃烧以产生热量而不是能量。