PREHNITE Ca2Al2Si3O10(OH)2 (orthorhombic). Light-green translucent botryoidal or mammillary aggregates. Paterson, Passaic County, New Jersey. 晶體細小板狀，常集結成似葡萄而得名，硬度 6-6.5 ，玻璃至珍珠光澤，常與沸石類共生於玄武岩或變質岩的間 隙中．

經典名礦欣賞．２．３
NO.512