SAPPHIRE. 35 t It occurs in small rolled pieces, fcnd crystallised. Its crystallizations are as follow: 1. Very acute, equiangular, simple, six-sided pyra mid. Fig. 21.*. ^ 2. Preceding figure truncated on the summit. Fig. 22. 3. Perfect six-sided prism, Fig. 23.; sometimes trun cated on the alternate angles, Fig. 24. 4. Acute, double, six-sided pyramid, in which the la teral planes of the one are set on the lateral planes of the other. Fig. 2.5. 5. The preceding figure acuminated on the extremi ties by six planes, which are set on the lateral planes. 0. I he preceding figure truncated on the extremities. 7. N° 4. truncated on the extremities. Fig. 26. 8. N° 3. acutely acuminated with six planes, which are set on the lateral planes. 9. The preceding crystal truncated on the summit. Fig. 27. 10. N° 1. acutely acuminated by six planes, which are set on the lateral planes. ‘ 11. The preceding figure truncated on the summit. The crystals are small, and middle-sized, and all a- round crystallised. The planes of the crystals are gene rally transversely streaked, and, when fresh, are usually splendent. Internally, its lustre is splendent and vitreous, some times inclining to adamantine. 1 he fracture is conchoidal or concealed foliated, with a fourfold cleavage. Three of the cleavages are parallel with the truncating planes on the alternate angles of the six-sided prism; the fourth parallel with the terminal planes of the prism. C 2 The " Formerly Haiiy viewed the primitive form of sapphire as a rcgvUsi hexahedral prism; now he considers it as s slightly acute rhomboid,