. Annals of the Lyceum of Natural History of New-York. Science. 52 On the Homceomorphisrn of Mineral /Species Jersey chondrocyte is 68°. The great difference of angle for these varieties of a single species should be considered, when judging upon the differences among the several species in the table. Taking 17 above as the unit dome, the vertical axis is twice that given in the table, or In Chrysolite, also, we have as good reason for doubling the vertical axis, in which case it becomes In Caledonite, the occurring brachy- dome has the angle 70° 57', and taking this as a unit
. Annals of the Lyceum of Natural History of New-York. Science. 52 On the Homceomorphisrn of Mineral /Species Jersey chondrocyte is 68°. The great difference of angle for these varieties of a single species should be considered, when judging upon the differences among the several species in the table. Taking 17 above as the unit dome, the vertical axis is twice that given in the table, or In Chrysolite, also, we have as good reason for doubling the vertical axis, in which case it becomes In Caledonite, the occurring brachy- dome has the angle 70° 57', and taking this as a unit dome, axis a = The relations of Polianite to Gothite and Diaspore appear to sustain the conclusion of Volger, cited in the American Journal of Science, vol. xvii., p. 213. Euchroite is generally placed in a different position, and the prism 117° 20' (form 17) is made the fundamental vertical prism. But it forms no stellate or hexagonal twins like species of that angle, and nothing appears to sustain that view in preference to the one above taken. Bournonite has the same relation to the species of section II. that Antimony Glance has to those of section I. It has very nearly the angles of Topaz. Wohlerite has quite recently been studied by the able crystal- lographer of Paris, M. Descloizeaux.* He gives for the verti- cal prism, the angle 108° 56'. But by comparing the range of angles with those of the above species, it appears that its true relations are exhibited by the position in the an- nexed figure, which is altered from Descloizeaux. This gives for the vertical prism, the angle 90° 54', and for the unit domes, the angles 108° 2' and 108° 56', very near Andalusite. It appears to be generally true that when a species affords for the prisms of two. * Ann. de Chim. et de Phys., vol. xl., 3d Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these il
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