黄珊瑚- 宝石是岩石中最美丽而贵重的一类。它们颜色鲜艳，质地晶莹，光泽灿烂，坚硬耐久，同时赋存稀少，是可以制作首饰等用途的天然矿物晶体，如钻石、水晶、祖母绿、红宝石、蓝宝石和金绿宝石（变石、猫眼）等；也有少数是天然单矿物集合体，如玛瑙、欧泊。还有少数几种有机质材料，如琥珀、珍珠、珊瑚、煤精和象牙，也包括在宝石之内。
珊瑚礁由珊瑚虫所组成，珊瑚虫是一种水母属的动物，它同海藻在一起称为虫黄藻。
A coral reef consists of coral polyps, which are animals in the jellyfish family, along with algae called zooxanthellae.
它们还从称为虫黄藻(zooxanthellae)的共生藻(symbiotic algae)中吸收营养素，虫黄藻还赋予珊瑚明亮发光的各种颜色。
They also receive nutrients from symbiotic algae known as zooxanthellae which also give coral their bright glowing colours.
硬和软珊瑚两者有共生关系和虫黄藻藻类，那些生活在珊瑚和给它的颜色。
Both hard and soft corals have a symbiotic relationship with zooxanthellae algae, which live in coral and give it its color.
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