It forms as fibrous, columnar or massive aggregates of crystals.

The luster is glassy to pearly with colors ranging from green, brown to dark grey.

It was discovered in 1853 and named after Emmanuel-Louis Gruner (1809–1883), the Swiss-French chemist who first analysed it.

Amosite is a rare asbestiform variety of grunerite that was mined as asbestos predominantly in the eastern part of the Transvaal Province of South Africa.

This article about a specific silicate mineral is a stub.