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蛋白石：硬度适中，它既能被雕刻成各种形状，保持较长的使用寿命
蛋白石：一种宝石级别的矿物，其化学成分主要是二氧化硅。这种矿物在自然界中通常以结晶体的形式存在，有时也会以非结晶的微粒状出现。蛋白石的硬度适中，这使得它既能被雕刻成各种形状，又能在日常佩戴中保持较长的使用寿命
小娟得全球知识杂谈合集861/1395
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