Florentine Stanislaus Bechtel,
Catholic Encyclopedia
(1913)
“ Alabaster (Gr. ἀλάβαστρος,–ον; Lat. alabaster, -trum; of uncertain origin) . The substance commonly known as alabaster is a fine-grained variety of gypsum (calcium sulphate) much used for vases and other ornamental articles. Oriental alabaster, the alabastrites of the classical writers, is a translucent marble (calcium carbonate) obtained from stalagmitic deposits; because of its usually banded structure, which gives it some resemblance to onyx, it is also called onyx marble, or simply, though incorrectly, onyx. From remote times it was highly esteemed for decorative purposes. ”

