holmquistite

holmquistite

[′hōm‚kwi‚stīt]
(mineralogy)
(Na,K,Ca)Li(Mg,Fe)3 Al2Si8O22(OH)2 A bluish-black, orthorhombic mineral composed of alkali and silicate of iron, magnesium, lithium, and aluminum.
References in periodicals archive ?
The pelitic unit may contain staurolite, garnet, and andalusite, whereas tourmaline and rare holmquistite (Hutchinson 1982) occur in the amphibolite adjacent to the pegmatite lenses.