The Nuttall Encyclopedia
A rare metal always found in combination with others, and is a blackish-gray powder; the oxide of it, yttria, is a soft whitish powder, and when ignited glows with a pure white light.
Wood, James, ed. Entry for 'Yttrium'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/y/yttrium.html. Frederick Warne & Co Ltd. London. 1900.