RoGERs. | Minerals of the Galena-Joplin District. 449 
writer: Aragonite (4)*, mimetite (16), vivianite (16), alu- 
minite (16), wavellite (16), and picropharmacolite (8). 
Minerals of the district arranged according to the metal 
present. 
CoPPER MINERALS: 
ZINC MINERALS: IRON MINERALS: 
Sphalerite. Chalcopyrite. 
Wurtzite. Pyrite. 
Smithsonite. Marcasite. 
Aurichalcite. Hematite. 
Hydrozincite. Limonite. 
Calamine. Melanterite. 
Goslarite. Copiapite. 
LEAD MINERALS: CALCIUM MINERALS: 
Galena. Calcite. 
Cerussite. Dolomite. 
Anglesite. Gypsum. 
Leadhillite. MAGNESIUM MINERALS: 
Caledonite. Dolomite. 
Linarite. 
Pyromorphite. BARIUM MINERALS: 
Barite. 
Covellite. MANGANESE MINERALS: 
Chaleopyrite. Pyrolusite. 
Cuprite. ALUMINIUM MINERALS: 
Malachite. Muscovite. 
Azurite. Kaolinite. 
Aurichalcite. Allophane. 
Chrysocolla. 
Galedonitel CADMIUM MINERALS: 
Laaeratea. Greenockite. 
Chaleanthite. 
Sulphur. 
Composition, S; hardness, 1-5—2-5; gravity, 2-05-2-09; color, sulphur-yel- 
low, straw- and honey-yellow, yellowish brown, greenish, reddish to yellowish 
gray; crystallization, orthorhombic system; cleavage, imperfect. 
This mineral, new for the district, was found as minute 
crystals on cleavage surfaces of galena. Similar occurrences 
are known from the Wheatley mines, Phceenixville, Pa. Ga- 
lena, PbS, in decomposing ordinarily gives rise to cerussite, 
PbCO;, passing, perhaps, through the intermediate sulphate 
stage, PbSO,, the sulphur being oxidized. The sulphur in 
this case, evidently secondary in origin, was set free remain- 
*The number in parentheses refers to the number of publication given in the bibliography. 
