- a white or grayish variety of amphibole, Ca2Mg5Si8O22(OH)2, usually occurring in bladed crystals.
- a white or pale green mineral of the amphibole group consisting of calcium magnesium silicate. When occurring in fibrous habit, it is used as a form of asbestos. Formula: Ca 2 (Mg,Fe) 5 Si 8 O 22 (OH) 2
