458 RECORD OF SCIENCE FOR, 1886. 



crystals are shown to be compouud in nature. The axial ratio obtained 

 is« : b : c=0.5843 : 1 : 0.4213; theimsmatic angle is llQo 24'. An anal- 

 ysis of the best material available yielded uncertain results because of 

 the admixture of percylite. A definite composition is obtained only 

 alter a series of assumptions, which impair the reliability of the result. 

 The caracolite and percylite are taken as present in about the ratio of 

 G : 1, and the final formula given for tlie former is PbGlHO+Na2S04, 

 whicli demands : 



:100 



In view of the remarkable nature of the compound a further exam- 

 ination of purer material is needed. 



Bognaoslmite. — Briefly mentioned by Krenner as a sulphobismuthite 

 of copper, occurring at Doguacska, in Hungary. It is massive, with a 

 .single perfect cleavage, and becomes gray or brown on exposure to the 

 air. An analysis by Maderspach yielded S 15.75, Bi 71.79, Cu 12.2S. It 

 is associated with gold, pyrite, chalcocite, and bismite. 



Emmonsite. — A ferric tellurite from the neighborhood of Tombstone, 

 Arizona, named by W. F. Ilillebrand after S. F. Emmons, of the U. S. 

 Geological Survey. It occurs in translucent crystalline scales of yel- 

 lowish-green col r imbedded in a hard brownish gangue, consisting of 

 lead carbonate, quartz, and a brown substance containing the hydrated 

 oxides of iron and tellurium. The crystallization is regarded as prob- 

 ably monoclinic; the specific gravity is about 5. The result of several 

 analyses, after impurities had been deducted, gave: 



Te Se Fe B.iO 



58.75 0.53 14.29 nudetenuined. 



The conclusion reached is that the mineral is a ferric tellurite, but 

 the formula is doubtful, and it needs further examination, based on purer 

 material. A related, but according to Dr. Smith, a distinct species is 

 his ferrotellurite. 



Harsiigite. — A new silicate of calcium, aluminium, and manganese, 

 from Pajsberg, Sweden, named and described by G. Flink. It occurs 

 with garnet ?mu1 rhodonite in small prismatic crystals, having a prismatic 

 angle of 109° 11'. The axial ratio is, « : & : c=0.7141 : 1 : 1.01495; the 

 habit is something like that of chrysolite. No cleavage was observed. 

 The hardness is 5.5, the fracture small eonchoidal or splintery, the spe- 

 cific gravity 3.049. It is colorless, with vitreous luster. The optic axial 

 plane is parallel to the brachypinacoid, and the axial angle in air is 

 90° 27' for yellow light. An analysis yielded: 



:20 NajO H2O 



99.89 



