名 称：珍珠岩

主要成分：酸性火山玻璃，主要化学成分为SiO2、Al2O3。

成 因：酸性火山熔浆经迅速冷凝形成的玻璃质岩石，个别含有透长石和石英斑晶，颜色较杂，但一般为珍珠色、白色等，其中同成分黑色者称黑耀岩。

形成时代：早白垩世

主要用途：防火、保温、隔音材料。

采集地点：内蒙古莫力达瓦达斡尔族自治旗

Name：Perlite

Composition：Acidic volcanic glass, mostly consisting of SiO2 and Al2O3.

Genesis：The glassy rocks were formed during fast cooling of acidic lavas, some of which contain sanidine and quartz phenocrysts. They rocks are of variegated color, mostly pearl-like or white colored, and the black colored are named as obsidian.

Age：The early Cretaceous.

Usage：Making materials for fire-proof, heat preservation and sound insulation.

Sample site：Molidawa, Inner Mongolia