Home > Rock Forming Minerals – June 20 > MS1352 Tilleyite

Tilleyite - Sold

Tilleyite is a calcium silicate carbonate mineral. Larsen & Dunham (1933) named the mineral in honor of Cecil Edgar Tilley (1894-1973), once a petrologist at Cambridge University (England). Tilleyite forms under rather special metamorphic conditions of high temperature combined with low concentrations of both aluminum and iron.

This is a massive sample of very pale lavender, essentially white tilleyite. The matrix consists largely of compact massive vesuvianite and grossular. Type locality. Collecting at this locality has been severely limited (or perhaps forbidden) for a couple of decades, so new material is not entering the market.