FELSPAH. 365^ my 45° 41' or 29° 42' win 37° 32' yz 66 31 gx 29 29 9° 29 8 wm' 37 32 gm' 81 12 oc 55 18 wz 63 6 nxo 57 43 uc - 81 56 rm 58 31 ne 36 26 mo 112 16 rz 72 40 sn 33 1 ec 33 30 qm 83 2 mn 84 46 cm 67 44 gz 86 22 FIG. 379. oz 55 1 t vz 21 2 FIG. 381. 382. c zn 39 48 75 57 FIG. 380. ni FIG. 383. Combinations. cm, xcm, xcmb..og.n.y.a.z, ycmb.x.o.n.z, Qxoycmzb, oxcrymb, oxcyutb.nvwz, oxcneswmb. The faces m, z, b striated parallel to their intersections with each other. Twins. 1. Twin-face c (fig. 88i). 2. Twin-faco n (fig. 382). 3. Twin- face a (fig. 383). 4. Twin-face z. Cleavage, c, very perfect, faces of union exist also parallel to c. b, perfect, sometimes v oterrupted by conchoidal fracture, and rather difficult to obtain ; m, traces. Fracture conchoidal...uneven. Trans parent... translucent on the edges. Lustre vitreous, c, pearly. it 3