PYROPHYLLITE Al2Si4O10(OH)2 (monoclinic)．pearly divergent crystal aggregate．
Staley, Randolph County, North Carolina．
葉臘石晶體常見長板狀，葉片狀，纖維狀，放射狀－radiating stellate aggregates 形成於滑石，雲母片岩中．硬度１∼２．常見白，灰，淺黃色，珍珠光澤，觸摸有油質感．與紅柱石，滑石，矽線石等礦共生．其變種壽山石－agalmatolite可作為藝品雕刻用．Mariposa County, California and North Carolina二處產生星狀，放射狀，珍珠光澤的高品質樣本．

經典名礦欣賞．２．３．４．５

NO.640