nBotryolite(Min) A variety of datolite, usually having a botryoidal structure.
Century Dictionary and Cyclopedia
nbotryoliteA variety of datolite or borosilicate of calcium, occurring in mammillary or botryoidal concretions, in a bed of magnetic iron in gneiss, near Arendal in Norway, and elsewhere. Its colors are pearl-gray, grayish- or reddish-white, and pale rose-red. It is said to differ from datolite in containing more water.