zinc. 157 



Obs. Occurs commonly with galena or blende, and usual- 

 ly in calcareous rocks. Found in Siberia, Hungary, Sile- 

 sia ■ at Bleiberg in Carinthia ; near Aix-la-Chapelle in the 

 Lower Rhine, and largely in Derbyshire and elsewhere in 

 England. In the "United States, it is abundant at Vallee's 

 Diggings in Missouri, and at other lead " diggings" in Iowa 

 and Wisconsin ; also in Claiborne County, Tenn. Sparingly 

 also at Hamburg, near the Franklin Furnace, N. J. ; at the 

 Perkiomen lead mine, Pa., and at a lead mine in Lancaster 

 County. 



Hydrozincite is a hydrous zinc carbonate, Zn0 3 C +2 ZnO a H, of a 

 whitish color, with G.=3'58-3'8. 



Aurichalcite is a hydrous carbonate of zinc and copper, occurring in 

 drusy incrustations of acicular crystals, having a pale verdigris-green 

 color. From Siberia, Hungary, England, and Lancaster, Pa. 



Buratite is a lime aurichalcite. 



Willemite. — Zinc Silicate. Troostite. 



Rhombohedral. R A 22=116° 1'. In hexagonal prisms, 

 and also massive. 



Color whitish, greenish yellow, apple-green, flesh-red, yel- 

 lowish brown. Streak uncolored. Transparent to opaque. 

 Brittle. H.=5-5. G. =3-89-4 -18. 



Composition. Zn 3 Si = Silica 27*1, zinc oxide 72*9 = 

 100. B.B. fuses with difficulty to a white enamel ; on char- 

 coal, and most easily on adding soda, yields a coating which is 

 yellow while hot, and white on cooling, and which, moistened 

 with cobalt solution and treated in O.F., is colored bright 

 green. Gelatinizes with hydrochloric acid. 



Obs. From Moresnet, between Liege and Aix-la-Chapelle ; 

 Raibel in Carinthia ; Greenland. Abundant at both Frank- 

 lin and Sterling, mixed with zincite, and used as an ore of 

 zinc ; also in prismatic crystals that occasionally are six inches 

 long. 



Calamine. — Hydrous Zinc Silicate. Galmei. 



Trimetric. In rhombic prisms, the opposite extremities 

 with unlike planes. I a 2=104° 13'. Cleavage perfect 

 parallel to I. Also massive and incrusting, mammillated or 

 stalactitic. 



Color whitish or white, sometimes bluish, greenish, or 

 brownish. Streak uncolored. Transparent to translucent. 

 Lustre vitreous or subpearly. Brittle. H. =4*5-5. G. =? 

 3 *1 6-3 *9. Pyro-electric. 



