. Annual report. New York State Museum; Science; Science. 20O NEW YORK STATE MUSEUM the disposal of the writer for study. The specimen consists of a mass of titaniferous magnetite forming portion of a joint plane in the ore body. The surface of the joint is covered with small crystals of magnetite of cubic habit closely associated with werner- ite in small transparent crystals. The comparative rarity of the cubic crystal habit in connection with magnetite1 together with the adaptability of these crystals to measurement, has rendered advis- able the following brief note: The magnetite crystals
. Annual report. New York State Museum; Science; Science. 20O NEW YORK STATE MUSEUM the disposal of the writer for study. The specimen consists of a mass of titaniferous magnetite forming portion of a joint plane in the ore body. The surface of the joint is covered with small crystals of magnetite of cubic habit closely associated with werner- ite in small transparent crystals. The comparative rarity of the cubic crystal habit in connection with magnetite1 together with the adaptability of these crystals to measurement, has rendered advis- able the following brief note: The magnetite crystals which average 2 millimeters in diameter are exceptionally brilliant, well developed and free from distortion. The simpler combination which is shown in figure 3 consists of the cube a (100) developed to a dominant crystal habit and modified. Fig. 4 Magnetite, Split Rock by the octahedron 0(111) and the dodecahedron d(no), both of these latter forms being present in small development. A more complex combination is shown in figure 4 and consists of the above forms developed to about equal habit and modified by the trigonal trisoctahedrons q(33i) and k(552) and by the new trapezohedron W = yOy== (711). They lie well in zone, the faces of the trigonal trisoctahedrons and of the dodecahedron being markedly striated parallel to the zone []. The planes of the trapezohedron ^(711) are small but extremely bright and give excellent reflec- tions. The forms were identified from measurements obtained from five of the best crystals. 1 Magnetite crystals of cubic habit were noted by H. Sjogren from Mossgrufva, Nordmark. Bui. Univ. Upsala. 1894-95. 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 New York State Museum. Albany : University of the State of New York
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectscience, bookyear1902
