Thomsonite Subgroup

Thomsonite is named after Thomas Thompson, Regius Professor of Chemistry, University of Glasgow, Scotland, who first analyzed the mineral.

Thomsonite forms transparent to translucent brown, green, red, pink, grey, white, yellow, colourless thin, bladed prismatic crystals or fibrous masses.

Thomsonite forms radiating spherical or columnar aggregates which resemble Agate. This material is cut into cabochons.

The eye-like material usually comes from Isle Royale, Michigan, USA.