Dahn in the Palatinate, with galena, and had been considered a 

 chromate of lead* It occurs massive but imperfectly crystallinGj 

 with some traces of a columnar structure. Color red, darker than 

 crocoisite, with a brownish tinge; streak pale yellowish. H. = 3. 

 B,B. on coal fuses easily with intumescence, and yields an arsen- 

 ical odor with a globule of lead, the latter being larger with soda. 

 With borax fuses in the reduction flame to a bright green glass, 

 which in the oxydation flame becomes gradually light olive green, 

 then clear yellow, and on cooling changes to a pale greenish tint. 

 Heated with concentrated muriatic acid, the powder easily de- 

 composes, and the liquid is first yellow, then brownish, and after 

 giving out chlorine, emerald green. On adding spirits of wine, 

 heating it, and pouring oflf from the solution the separated chlo- 

 rid of lead, it is still green ; but on concentrating it by means of 

 a vapor bath and then diluting it with water it takes a fine sky- 

 blue color. In this characteristic, it is like other allied vanadium 

 compounds. Von Kobell found in the mineral 48-7 p. c. of oxyd 

 of lead and 16*32 of oxyd of zinc. The vanadium lead ore 

 analyzed by Damour contained only 6'34 p. c. of oxyd of zinc. 

 —{J. I pr. Chem., 1, 496.) 



Enargite, a new ore of Copper ; A. Breithaupt, (Poggend. 

 Ann., Ixxx, 383.) — Enargite comes from Morococha, district of 



\ 



206 Mineralogical Notices. 



form of its concretions, and is from 71^00;, orhiculahis. Structure ra* 

 diatir)g, and surface of the concretions appearing striated owing to 

 the plates of which it is formed rising to irregular distances above 

 the surface J cleaves easily parallel to the plates. Color white; 

 lustre vitreous, passing into pearly on exposure; perfectly trans- 

 parent in thin plates. Very tough. Hardness between 3 and 4. 

 B.B. yields water, swells up and separates into thin pearly or 

 silvery plates. On charcoal swells up, splitting into thin lamiiise 

 and fuses to an opake enamel. With borax, yields a transparent 

 colorless glass] with soda fuses with difficulty to an opake mass. 

 Readily attacked by hydrochloric acid. 

 Composition according to T. Anderson, 



Si Si Ca Mg fl 



60-70 1-48 S3-24: 0-18 14-18=99-78 



Oxygen 26-86 9-49 12*60 



He thence deduces the oxygen ratio for the lime, silica and water, 

 (considering the other ingredients as unessential,) 1:3; li, and 

 the formula 26181+3^:. The formula requires a little less lime 

 and more silica and water, which discrepancy Mr. Anderson at^ 

 tributes to partial efflorescence. The ratio of lime and silica is j 



the same as in Edelforsite. Its efflorescence and crystallization 

 in plates distinguish it from dysclaslte. 



ArcBoxene^ a neia vanadate of Lead and Zinc, — Kobell re- 

 ceived this new mineral through Prof. Dobner. It was found at 





