. Annual report . lt;x(110) in all cases determine the habit. Insome cases the prism M is larger, in other cases smaller, than the dome S, thus caus-ing variation in habit. The forms e=10(101) and 1=01(011) occur with very small,unimportant I: A simple crystal; dimensions lxl-5X- mm. Fig. 3a shows the crystal as top view. Fig. 3j in : m, s equally developed. e II: Penetration twin. Dimensions of the group 2\2> 1 mm. Twinning plane e=10(101). Fig. 4 shows this crystal as top view, projected on the face a=0cc (010) commonto the two individual


. Annual report . lt;x(110) in all cases determine the habit. Insome cases the prism M is larger, in other cases smaller, than the dome S, thus caus-ing variation in habit. The forms e=10(101) and 1=01(011) occur with very small,unimportant I: A simple crystal; dimensions lxl-5X- mm. Fig. 3a shows the crystal as top view. Fig. 3j in : m, s equally developed. e II: Penetration twin. Dimensions of the group 2\2> 1 mm. Twinning plane e=10(101). Fig. 4 shows this crystal as top view, projected on the face a=0cc (010) commonto the two individuals. m, s, , e, small. I Hi: Penetration trilling. Dimensions of the group nim. Twinning plane here also e=10(101). It has only the forms m=uz (brilliant). 0j (striated), about equally developed. The three individuals of the groupare of about the same size. hows th trilling as top view, projected on the face a=0 si (010) commonto th three individuals. 1V13 CobaIt=Nickel Arsenides and Silver 23.


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Keywords: ., bookcentury1800, bookdecade1890, booksubjectminesandmineralresou