珍珠岩——世界珍珠岩储量估计为20亿吨。主要的矿区分布在希腊米洛斯岛和科斯岛,意大利的撒丁岛,以及苏联、匈牙利、中国、美国、墨西哥、土耳其和日本。每年世界珍珠岩的产量为160万吨。开采量较大的是美国、苏联、希腊、匈牙利和意大利。在阿根廷、澳大利亚、保加利亚、捷克、冰岛和南斯拉夫也有小规模开采。大部分矿场采用露采法。 Perlite, the world’s perlite reserves, is estimated at 2 billion tons. The main mining areas are located in Milos and Kos islands in Greece, Sardinia in Italy, and the Soviet Union, Hungary, China, the United States, Mexico, Turkey and Japan. Each year, the world production of perlite is 1.6 million tons. The larger amounts extracted are the United States, the Soviet Union, Greece, Hungary, and Italy. There are also small-scale mining operations in Argentina, Australia, Bulgaria, the Czech Republic, Iceland and Yugoslavia. The mining method is used in most mines.