APPENDIX. 



15 



clination of axis=C=101° 29'. Observed planes /, 0, i-2, 1, 1-?. Ja/=105° 15', 0aI-i=U6° 

 2S', 0Al=142°5', Ia «-2=160 = 34'. Crystals minute. Also massive. H.=25. G.=2'244. 

 Color of the massive mineral bluish-green to reddish-yellow. The crystals sometimes color- 

 less and transparent. Taste faint, saline, and bitter. Unaltered on exposure to the air. 

 Analysis : G. Tschermak (1. c. ) : 



S % Na H 



4747 12-65 18-86 21 -82=100-50 



This yields the oxygen ratio for B : S : H, 1 : 3 : 2 or ft S-f 2H, the same as the formula 

 given for Blcedite (p. 643 1, which mineral it also resembles in crystalline form. Tschermak 

 remarks that simonyite differs from blosdite in not efflorescing on exposure to air, and losing 

 only a portion of its water (4 90 pr. ct.) on being heated for two hours in a water-bath. 

 Occurs at Hallstadt. 



A mineral of the same composition and form, likewise unalterable in air, found at Stass- 

 furth, has been referred by Groth and Hintze to blcedite, these authors assuming that the 

 efflorescence of blcedite, noticed by earlier observers, was due to mixture with some efflo- 

 rescent salt. ZS. G. Ges. 1871, S70. 



Stibiotriargentite, Stibioliexargentite, see Dyscrasite. 



595 A. Sussexite. G. J. Brush, Am. J. Sci., II. xlvi. 140, 240, 1868. 

 In fibrous seams or veins. H. =3. G.=3 - 42. Lustre silky to pearly. Color white with 

 a tinge of pink or yellow. Translucent. 

 Composition: (Mn, %) 2 B + H or (j (Mn, Mg)+£ H) 3 B. Analysis: G. J. Brush (1. c.) : 



B Mn Mg H 



31-89 40-10 17-03 9-59=98-61 



In the closed tube darkens in color and yields neutral water. If turmeric paper is mois- 

 tened with this water, and then with dilute muriatic acid, it assumes a red color (boric acid). 

 In the forceps fuses in the flame of a candle (F=2), and B. B. in O. F. yields a black crys- 

 talline mass, coloring the flame intensely yellowish-green. With the fluxes reacts for man- 

 ganese. Soluble in chlorhydric acid. 



Found on Mine Hill. Franklin Furnace, Sussex Co., N. J., associated with franklinite, 

 zincite, willemite. and other manganese and zinc minerals. This species approaches in com- 

 position the mineral szaibelyite. 



Talcosite. G. IT. F. Ulrich, Contributions to the Mineralogy of Victoria, Melbourne, 

 1870 (pamphlet of 32 pp. 8vo.). 



In thin seams and threads with scaly structure, the scales apparently rhombic plates. H. 

 = 1—2. G. =2'40— 2'5. Lustre pearly. Color silver-white, faint greenish, or yellowish. 

 Scales flexible but not elastic. Kesembles talc. Analyses 1. 2 by C. Newbery (1. c.) : 



Na H 



. tr. 4-98=99-09 



\ tr. 3-73=99-76 



The oxygen ratio of anal. 1 for H, Ad, Si is 1 : 5 : 6. This mineral is perhaps related to 

 selwynite. with which it occurs, and also to westanite (described in this appendix). 

 Obs. From Mount Ida near Heathcote, Victoria. 



TdhtrwisrnvtJisilber. G. RwnmeUberg, ZS. G. Ges., xxi. 81. 



Granular. Gr.=7"803. Lustre metallic. Color gray, tarnished. Cuts with a knife, but 

 sufficiently brittle to be readily pulverized. Composition : analysis by Rammelsberg, 1. c. : 



S Te Bi Ag Cu 



3-32 24-10 48-50 23-35 tr. =99-27 



Rammelsberg gives the relation of S : Ag : Bi : Te as 1 : 2 -08 : 2 -24 : 1'8, but thinks it 

 may be more correctly expressed by 1 : 2 : 2 : 2, as the bismuth obtained was not free from, 

 tellurium, and the formula of this new tellurium mineral may then be written Ag- S + 

 Bi- Te J or Ag 8 S + 2 Bi Te ?. He also questions whether the mineral may not be a mix- 

 ture of argentite and tellurid of bismuth, or of native silver and sulphotellurid of bismuth, 

 but finds nothing in the physical properties of the mineral to indicate a mixture. 



Obi, From Sierra de Tapalpa, Mexico. 





Si 



Al 



Cr 



Fe 



Mg 



1. 



49 01 



45 10 



tr. 



tr. 



tr. 



2. 



49-07 



46-96 



tr. 



tr. 



tr. 



