常温下为黑色固体，在一定的温度下凝固成很脆的具有贝壳状断口的固体，呈玻璃相；
Soft pitch is a black solid at a certain temperature , it will be solidified into a brittle solid with shell-like fracture.
贝壳中的文石相在结合水和有机质的“调和”作用下，其相转变温度与天然文石相比下降了很多。
With the help of hydration water and organic matrix, the transition temperature of the aragonite in the shell is lower than the natural aragonite.
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