A fine, compact, usually white claylike mineral of hydrous magnesium silicate, H4Mg2Si3O10, found in the Mediterranean area and used in fashioning tobacco pipes and as a building stone.

• 海泡石氢氧化镁的矽酸盐矿石，通常为优质致密的白色陶土状物，H4Mg2Si3O10，产于地中海地区，用来制作烟斗和建筑用石