綠纖石(英語:Pumpellyite)是一種含水的鈣鎂鋁矽酸鹽礦物,Ca2MgAl2[Si2O6OH][SiO4](OH)2(OH)其中鎂,可被亞鐵,錳,鈣所置換。屬單斜晶系。呈纖維狀、針狀集合體。綠褐色。玻璃光澤。硬度5.5~6.5。密度3.2g/cm³[1]。Pumpellite 以杏仁狀和裂縫充填物形式出現在變質的玄武岩和輝長岩中。 它是葡萄石-綠纖石變質相的指示礦物。 它與綠泥石、綠簾石、石英、方解石和葡萄石有關[2][3]。
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