116 F. A. Genth — Contributions to Mineralogy. 



a. b. 



Loss by ignition 14-30 19-93 



SiO, .- 46-19 1-42 



A1,0, 38-82 40-81 



Cr a O, 1. 0-S2 



Fe„0 3 2-19 



Cu - 8-83 



P„(X -- 26-52 



100-13 99-70 



From this analysis it will be evident that the gold-bearing 

 mineral is not turquois, but a chromiferous clay. 



b. Entirely different is the auriferous mineral received from 

 Mr. James W. Beath. It consists of brown ferruginous quartz, 

 apparently free from gold with a vein from 5 to 12 mm in width 

 of a greenish blue quartz with crystalline, deep yellow gold 

 disseminated. The analysis of the greenish blue mineral gave : 



Loss by ignition 4-44 



SiO, 86-75 



CuO 8-60 



99-79 



or a quartz with an admixture of about 19 per cent of chryso- 

 colla. 



5. Zircon. 



With the masses of monazite at Mars Hill, Madison Co., 

 ~N. C, is rarely associated zircon in crystals of considerable 

 size. One, which I picked out from a lot of monazite, fur- 

 nished the material for the following analysis. It was 40 mm 

 long, 23 mm broad, rough and irregular, showed only the prism 

 and several pyramidal planes. Spec. gr. =4*507. The analysis 

 gave : 



Loss by ignition — 1-20 



SiO a - 31-83 



Zr0 9 ._ 63-42 



Fe„0., - 3-23 



99-68 



6. Scapolite. 



At the Elizabeth Mine, French Creek, Chester Co., Pa., at a 

 depth of 400 feet small crystals of scapolite have been ob- 

 served, as a rarity ; — it appears to have resulted simultaneously 

 with another variety of garnet from the alteration of essonite. 

 They are filling cavities of a brownish gray and ash-gray 



