PREHNITE Ca2Al2Si3O10(OH)2 (orthorhombic). Light-green translucent botryoidal or mammillary aggregates. Paterson, Passaic County, New Jersey. 本礦因外觀似葡萄而得名，硬度 6-6.5 ，常與沸石類共生於玄武岩或變質岩的間隙中．由John Betts先生所收藏和提供．
礦名來源：Named after the Dutch Colonel, H. Von Prehn (1733-1785).

經典名礦欣賞 ．２．３．４．５．６．７．８．９．10
NO.19