Arizona republican., 1909-02-25

StIiOn NdrtdDie.
 This hard, black and heavy min eral appears to be widely distributed in the Piedmont region of the noun tains of Central Arizona, judging by the many samples sent in to the School of Mines for determination. It is often supposed to be wulframite, or hubnerite.
 INFUSoRIAL EARTH.
 See diatemite.
 IoDoBRoMlTE.
 Silver with iodine, bromine and chlorine. Silver 60.2, iodine Al, bro- mine IFS, chlorine 7.9.
 This rare mineral occurs in thin seams and crusts in a silver bearing vein of quartz and calcite near Globe, Pinal county. (Hechman's mine.) Its specialization is obscure, but the species is known to crystalline in the monometric system. It is soft, like tale, luster vitreous; color light lem on-yellow to sulphur-yellow and ca nary-yellow. The reactions before the blowpipe are remarkably beautiful and interesting. Heated in a closed tube with bisulphate of potash the mineral quickly changes color to a dark sal mon or orange-red; heavy brownish- red fumes of bromine are given off and bromine condenses in the higher portion of the tube; violet vapor of iodine then appears and crystals of iodine form below, or nearer the assay, than the condensed bromine. The fused assay floating in the Aux is brilliant cherry-red, at first a very dark red. but as cooling progresses it gradually loses this color passing through various shades of red until the normal yellow color is re- stored. The fused mass then being removed from the tube and relocated until all the bromine is expelled Nand then heated with carbonate of soda on charcoal a button of metallic sil- yer Is obtained. The fused carbonate of soda dissolved from the coal re- acts for chlorine with silver nitrate. In the final reduction of the assay to metal a slight yellow areola, like that from lead was observed and referred to probable slight impurity. (W. P. B.. Am. Jour. Sci, Vol. XIX, March 1se5.)
 IoDYRITE.
 Silver iodide; iodine 54. silver 46.
  Cruz county. Specimens sent by MT. Edw. E Noon in 1903 to the School of Mines had a reddish brown color which rapidly darkened in sunlight to an olive green. So, also, the yellow powder and yellow streak of the min- eral rapidly changes colcr on expos ure to the suns rays. Hardness 2.5 to g. On charcoal before the blowpipe gives a bluish flame, a yellow areola, and globules of silver and some lead with a yellowish- brown coating near the assay with carbonate of soda. Fuses with great ease and gives off white vapors, yielding a black glob- ule which sinks into the coal and on further smelting the coal becomes .sheeted with globules of silver.
 Reported to occur also at the Cerro Colorado mine.
 IRON.
 Native or metallic iron, Meteoric iron.
 Although metallic iron is not known occur in the rocks of Arizona, we have several localities of immigrant masses from other worlds, or at least from the regions of space, masses of nearly pure malleable iron with a few per cent of nickel and cobalt, known to mineralogists as meteoric iron or as siderites, which have come to us bearing pyritous nodules and some times crystallized carbon in the form of diamonds.
 The celebrated Ring Meteorite,' known in the annals of the national