SaPPHIR^/ 87 ^ r a£ture conchoidal in true fapphire *; in thofe k^eties which are denominated oriental ruby it pre> s a three-fold oblique angular cleavage, which is ^Hel with the fides of the rhomboid. r 3gments indeterminately angular. . ls more or lefs tranfparent, even fometimes paff- S to tranflucent, and there are varieties that, when at 5 and expofed to the rays of the fun, exhibit a ftar fix rays. yi | ' n higheft degree, refilling the file, but to the diamond, afily frangible. ‘ s heavy. Pacific gravity—From 3,980 to 4,180, Werner.—3,994 4 2ft r ^ ’ 3> Hauy—4,occ, Kirwan From 4,000 to 4,083, ett W Grevilte.—3,907 to 4,161, Bournon. Constituent Parts. Silica A1 umi ua utie *yd of iron o 98,5 °>5 1,0 100 Klaproth, t. 1. p. 83. 35.° j8,o 5»o 2,0 100 Bergman. * C ; o K Ul ? t . ^ ournon '8 of opinion that a three-fold cleavacre -Mmcd in fapphire. Sapphire.