Tags: Chemical Substance, Mineral.

Grunerite is a mineral of the amphibole group of minerals with formula Fe7Si8O22(OH)2. It is the iron endmember of the grunerite-cummingtonite series. It forms as fibrous columnar or massive aggregates of crystals. The crystals are monoclinic prismatic. The luster is glassy to pearly with colors ranging from green brown to dark grey.

Gruenerite_Schist_Metamorphic_Rock_North_of_Keystone_South_Dakota_2916.jpg

Loading...

This page contains content from the copyrighted Wikipedia article "Grunerite"; that content is used under the GNU Free Documentation License (GFDL). You may redistribute it, verbatim or modified, providing that you comply with the terms of the GFDL.