CaTS£Y£. 201 Internally It Is fliinlng, and intermediate between Htreous and refinous. Frafture fmall and a little imperfe&ly conchoidal, fometimes approaching the uneven. Fragments indeterminately angular, and more or kfs (harp edged. It is commonly tranflucent, fometimes alfo femi- tranfparent, and in other varieties only tranflucent on the edges. It fometimes prefents flender white rather opaque fibres that are parallel to each other ; the particular a Ppearance, which is termed chatoyant, is produced by the reflexion of the rays of light from thefe fibres. Uo Hard. Eafily frangible. .tmen.r.L ^ Not particularly heavy. ' ■a Specific gravity—From 2,625 to a,6co, Klaproth. Chemical Characters. ' J I By expofure to the heat of a porcelain furnace lofes its hardnefs, luflre, and tranfparency, and partly its colour, but is not melted. Before the blow P*pe, according to Sauflure, it melts with great diffi culty. « D d . Constituent