riEEHOTINE. 161 Rhombohedral. EIG. 149. o ill, a Oil. 90 u 0 60 0 Combination, oa. The faces a striated parallel to their intersections with o. Cleavage, o very perfect. Opaque. Lustre resinous, inclining to metallic. Indigo blue. Streak black, shining. Sectile. In thin leaves flexible, ii = r5...2-o. o = 3'80...3-82. CuS, copper Cfl'44, sulphur 33-66. Analyses of covelline a from Badenweiler by ‘Walchner, b from Vesuvius by Covelli:— a b Copper .... 64'77 66'0 Iron 0'46 — Lead ros — Sulphur .... 32'64 32’0 Before the blowpipe burns with a blue flame. Melts with ebullition into a globule which with soda yields a bead of copper. Soluble in nitric acid. In crystals, massive, reniform, investing other minerals. _ Is found in the kupferschiefer at Sangerhausen in Thuringia; m the Hausbaden mine near Badenweiler with redruthite and towanite ; in the Herrenseegen mine at Schapbach in the Black Forest with towanite, at Kielce in Poland, crys tallized with calcite in clay slate at Leogang in Salzburg, in tho crater of Vesuvius. 52. PYRltllOTINE. — Magnetic iron pyrites ; Phillips. Per sulfure magnetique ; Hauy. lthomboedrischer Eisen-Kies ; Mobs. Magnetkies ; liausmann. Pyrrliotin ; Ilaidinger. lihombobedral. 100,111 = 60° l'. Ill, a Oil, b 211, T 100, ao 90° o' XO 44° 44' aa 60 0 ZO 63 25 ha 30 0 XX 41 12 TO 60 7 ft XX 75 6 or t 00 7 zz 53 8 rr 97 20 zz” 101 32 rr t 51 23 r t 122, x 120, * FIO. 150. 131.