棱柱是特殊的多面体，分为直棱柱和斜棱柱。其中，侧棱与底面垂直的棱柱称为直棱柱。
块石形状应接近直棱柱体，或有规则的四边形或多边形。
The shape of block stones shall be close to straight prism or regular quad or polygons.
铁块会一直加热，直到到达某一燃点，便会辐射出光来；而当它的光线穿过一块棱柱时，棱柱就会分割光线，形成光谱。
This light is passed through a prism, which breaks it up into a spectrum, and a unique pattern, kind of like a chemical fingerprint of spectral lines for that element appears.
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