. Bulletin of the University of Wisconsin. Science. HOBBS MINERALOGY OF WISCONSIN. 113 The angles were measured on two crystals with the fol- lowing results: Measured. Calculated. m : s, 1010 : 1121 38° V 37° 58' s : r',,1121 : 7187 23 12 23 15 r'4 : z, 7187 : 0111 5 31 5 39 T\ : w, 7187 : 1010 61 12i 61 13 r : z, 1011 : 1101 46 34 46 16 r : s, 1011 : 1121 28 55 28 54 m : r, 1010 : 1011 38 11 38 13 m : a, lOlO : 47. 0. 47. 30 28 56 28 57 " m : m, 1010 : 1100 60 0 60 0 The considerable variation from the theory in the meas- urement fo the angle rz is due to the vicinal character of the fac
. Bulletin of the University of Wisconsin. Science. HOBBS MINERALOGY OF WISCONSIN. 113 The angles were measured on two crystals with the fol- lowing results: Measured. Calculated. m : s, 1010 : 1121 38° V 37° 58' s : r',,1121 : 7187 23 12 23 15 r'4 : z, 7187 : 0111 5 31 5 39 T\ : w, 7187 : 1010 61 12i 61 13 r : z, 1011 : 1101 46 34 46 16 r : s, 1011 : 1121 28 55 28 54 m : r, 1010 : 1011 38 11 38 13 m : a, lOlO : 47. 0. 47. 30 28 56 28 57 " m : m, 1010 : 1100 60 0 60 0 The considerable variation from the theory in the meas- urement fo the angle rz is due to the vicinal character of the face z. With this exception the faces gave excellent images of the signal. Arsenopyrite in dike rock at Marquette, Green Lake County.— This mineral is found as an accessory constituent in a diabasic rock which occurs in a small dike in Marquette, Green Lake county. The locality is on the south side of the hill south of Mr. Ingalls's house and about one and one- fourth miles south-southwest of the village of Fig. 2.—Arsenopyrite prom Marquette. The mineral occurs in crystals three to four millimetres across and bounded by the forms u, iPco (014) and m, coP, (110) (See Fig. 2). The ti faces are as usual striated par- allel to their intersection. The faces are all bright and reflect well, but are too much rounded to admit of measure- ment Heated on charcoal in the oxidizing and reducing flames of the blowpipe, arsenic and sulphur fumes are. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original University of Wisconsin. Madison, Wis. : The University
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