eckermannite

eckermannite

[′ek·ər·mə‚nīt]
(mineralogy)
Na3(Mg,Li)4(Al,Fe)Si8O22-(OH,F)2 Mineral of the amphibole group containing magnesium, lithium, iron, and fluorine.
References in periodicals archive ?
[ ] Eckermannite, Na[Na.sub.2]([Mg.sub.4]Al)[Si.sub.8][O.sub.22][(OH).sub.2], mon., forms a series with Ferro-eckermannite, Amphibole group, Can.
[ ] Ferro-eckermannite, [Mathematical Expression Omitted], mon., forms a series with Eckermannite, Amphibole group, Can.