WOLLASTONITE CaSiO3 (monoclinic)．pyroxenoid group．silky sprays in fine grained quartz． Maricopa County, Arizona．

硅灰石晶體常呈板狀，纖維狀，白色至淺灰色．玻璃至珍珠光澤．硬度 4.5∼５，由不純的石灰岩變質而成（CaCO3 + SiO2 ----> CaSiO3 + CO2 ）．好發於火成岩，區域變質岩中．產自於 Franklin, New Jersey區有螢光反應．

礦名來源：Named after the English mineralogist and chemist, W. H. Wollaston (1766-1828).

經典名礦欣賞 ．２．３．４
NO.636