Geology and Natural History. 85 



Seligmannite. A new species described by Baumhauer from 

 the dolomite of the Binnenthal in Switzerland; it is named after 

 the mineralogist, G. Seligmann of Coblenz. The material was 

 too scanty to allow of analysis, but its close identity with bourn- 

 onite in complex crystalline form and the similarity in color and 

 luster and brittleness to sartorite (scleroclase), have led the author 

 to the conclusion that it is a lead sulpharsenite isomorphous with 

 the former species. — Ber. Ah. Berlin, p. 110, 1991. 



Hussakite. A mineral occurring in tetragonal crystals and in 

 crystal fragments at Dattas near Diamantina, Minas Geraes, 

 Brazil. The form is identical with that of xenotime, but analy- 

 sis showed the presence of 6 p. c. S0 3 . The results obtained are 

 as follows: 



S0 3 P 2 5 (Y, Er, Gd) 2 3 Fe 2 3 



f 613 33-51 60-24 0'20 — 100-08. 



The hardness is 5; sp. gravity 4*587; the color, yellowish white 

 to honey-yellow and. brown. The authors, Kraus and Reitinger, 

 suggest that the xenotime hitherto analyzed may have been 

 altered irom hussakite, the S0 3 having been removed ; they 

 regard Gorceix's earlier analysis of the Brazilian mineral, which 

 showed no S0 3 , as incorrect. — Zeitschr. JTryst., xxxiv, 268. 



Certjleite. An arsenate of aluminum and copper from the 

 gold mines of Huauaco, Chili, described by H. Dufet. It occurs 

 in clay-like masses of a turquois-blue color; these masses consist 

 of very minute crystals. The specific gravity is 2-803. An 

 analysis gave the following results: 



As O 34-56 Al O 31-26 CuO 11-80 HO 22-32 = 99-94. 



2 5 



■psnonds flrmroximfltpl v to thp. formula DnO 9A1 



This corresponds approximately to the formula CuO . 2A1 2 0, 

 As 2 5 + 8H 2 0.— Ball. Soe. Min., xxiii, 147, 1900. 



Sclvanite. A sulpho-vanadate of copper described by G. 

 Goyder from Burra, South Australia. It occurs in masses with a 

 metallic luster and bronze-yellow color; hardness 3*5; specific 

 gravity 4*0. The calculated formula is 3Cu 2 S'V 2 S 5 , deduced 

 from two analyses, one of which is as follows: S 32*54 V 12*53 

 Cu 47*98 Si0 2 4-97 Fe 2 3 0-42. The silica and iron are due to 

 impurities. — J. Chem. jSoc. Sept. 1900, p. 1094. 



Termierite, Lassallite. Two silicates of aluminum described 

 by G. Friedel as occurring with kaolinite and barite at the anti- 

 mony deposits of Miramont on the borders of Cantal and Haute- 

 Loire, France. The composition of termierite is regarded as 

 expressed essentially by the formula A1 2 3 . 6Si0 2 + 18H 2 ; an 

 an analysis gave: SiO„ 78*29, A1 2 3 15*00, Fe 2 3 (FeO pt. ?) 4*85, 

 CaO 1*77, MgO 0*47 = 100*38. It occurs in small masses of a 

 gray color and conchoidal fracture. 



Lassallite occurs in white fibers resembling asbestus. An 

 analysis of dried material gave : Si0 2 69*27, A1 2 3 19 42, Fe 2 3 

 0*84, MgO 10*01, CaO 1*30=100-84; H 2 14*22. The calculated 

 formula is 3MgO . 2A1 2 3 . 12Si0 2 + 8H 2 0.— Bull. Soc. Min., xxiv, 

 4, 1901. 



