. The Philosophical magazine; a journal of theoretical, experimental and applied physics . Fig. 3. Fio ■ SlcuXiefVuiite Mjn( mlernBrof, \\iK Mr. L. Fletcliers CrystalloyiapMc Notes, 475 Ten years later Sclieerer* met with a mineral which ex^amination led him to regard as identical with that previouslydescribed by Breitliaapt. A quantitative analysis, afterwardi?confirmed by Wohlerf, gave the following result:—- Arsenic 77-84 Cobalt 20-01 Sulphur 0-61) Iron 1-51 Copper traces 100-05 a composition expressed by the formula CoAsy. The description given by Scheerer agrees very closely withthat o

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. The Philosophical magazine; a journal of theoretical, experimental and applied physics . Fig. 3. Fio ■ SlcuXiefVuiite Mjn( mlernBrof, \\iK Mr. L. Fletcliers CrystalloyiapMc Notes, 475 Ten years later Sclieerer* met with a mineral which ex^amination led him to regard as identical with that previouslydescribed by Breitliaapt. A quantitative analysis, afterwardi?confirmed by Wohlerf, gave the following result:—- Arsenic 77-84 Cobalt 20-01 Sulphur 0-61) Iron 1-51 Copper traces 100-05 a composition expressed by the formula CoAsy. The description given by Scheerer agrees very closely withthat of Breithaupt; but not only did he find the mineral inits massive condition, but also as isolated ci-ystals. These hadthe form of octahedra, modified by the cube dodecahedronand an icositetrahedron: the inclination of the faces of thelatter form to the adjacent face of the octahedron, as measured,was 19° 27, proving clearly that the icositetrahedron Avas(2 11), for which the calculated angle is lii° 28; the faces ofthis particular icositetrahedron truncate the edges of the do-deca

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