RoGERs. | Minerals of the Galena-Joplin District. 501 
Goslarite. 
A prominent locality for goslarite is the Moll tract, Ga- 
lena, where it has been formed by the oxidation of the white 
amorphous zinc sulphide described by Robertson.” It occurs 
in white fibrous masses and capillary crystals, and is evi- 
dently quite free from impurities. 
Goslarite also occurs as botryoidal and stalactitic incrusta- 
tions on the walls of shafts and ‘‘cave-ins,’’ as at the Sun- 
shine mine, Galena, and the Pilgrim mine, Cave Springs. 
Ferrogoslarite, described by Wheeler,” is a zinc sulphate 
containing ferrous sulphate. It occurs on the wall of a large 
body of sphalerite, with which marcasite is associated, and 
its origin is due to the oxidation and leaching of these sul- 
phides and subsequent crystallization. The material is light 
yellow to brown in color, with vitreous luster, and occurs in 
subtransparent mammillary and stalactitic incrustations. The 
analysis is as follows: 
ENS Orme Rare etm eee eee, AU UIE A AS 55.20 
IMENSLO VIS ELA Sa A Be OC LU OE aR SS EA 4.90 
FS OM Aged nu nae ay cei ee 39.00 
SOs ee Wee oy rire eh le Bale 0.40 
VENUE OR 22RD ie Rec MANO PR Fe 0.40 
MO bape era eh tie pte ea a a 99.90 
Cuprogoslarite, described by the author,” is a zinc sulphate 
containing copper sulphate. It occurs in the same way as 
ferrogoslarite on the walls of a ‘‘cave-in’’ at the Sunshine 
diggings, in the western part of Galena, near Owl creek. 
The analysis is as follows: 
YOR INSS O VS OM ie 2 IE PC A BGR ee 45.16 
CUS O eee ie eae ras Men enr as 12.48 
LEAS Orig iin es eB ECE AH a a ea aa 0.27 
TET © ROE ee sree tetera aie MR Mee eta 41.76 
ImSolu bl everett oon artemis ss 0.58 
100.00 
A determination of copper in another specimen gave Mr. 
Edgar B. Hayes 14.31% CuSQ,. 
22. Robertson: Amer. Jour. Sci., vol. 40 (8), pp. 160, 161, 1890. 
28. Wheeler: Amer. Jour. Sci., vol. 41 (8), p. 212, 1891. 
24. Rogers: Kan. Univ. Quar., vol. 8, pp. 105, 106, 1899. 
