An icicle-shaped mineral deposit, usually calcite or aragonite, hanging from the roof of a cavern, formed from the dripping of mineral-rich water.

• 钟乳石：一种冰柱状的矿物沉淀，通常为方解石或者霰石，悬挂在一个熔洞的顶部，由含有丰富矿物的水下滴形成