Davies Gilbert, a former President of the Royal gilbertite

[Named by Thomson after Mr. Society of England.] Min.: A whitish, silky mineral: its hardne 2.75; specific gravity 2.65. Composition: Silica 45.15; alumina 40-11; protoxide of iron 2'43; magnesia 1.90; lime 4'17; and water 4:25. Apparently an impure kaolinite. Occurs near St. Austle in Cornwall, England. ( Dana . )