APPENDIX. 



CATALOGUE OF MINERALS OCCURRING IN THE SWEET- 

 WATER DISTRICT. 



The catalogue herewith presented is a very meagre one considering 

 the area over which our explorations extended. This is due, in part, to 

 the fact that but a very small portion of the area was composed of min- 

 eral-bearing rocks, and partly to the fact we have no time to search sys- 

 tematically for them. It was my intention to prepare a catalogue cover- 

 ing the entire territory, but the requisite information upon the subject of 

 distribution of mineral species does either not exist or is not available. 

 Whenever the necessary amount of material may have been collected for 

 such a purpose in a manner that it may be utilized, I propose to carry 

 out my original plan. 



Amphebolite. — Small crystals in the hornblendic schists of the metallif- 

 erous series. Green, partly fibrous, in granitic syenite near Rawlings. 



Augtte. — Minute crystals in the basalt near Essex Mountain. Found 

 also in some of the basalts northwest of Salt Wells. 



Azurite. — The result of decomposition of chalcopyrite in Seminole 

 Mines. 



Biotite. — Small, six-sided crystals in basalts. Together with augite. 



Calotte. — Crystallized in small fissures and druses of Carboniferous 

 limestone. On Beaver Creek, along the eastern base of Wind River 

 Mountains, and in Seminole Hills. Scalenohedra, rhombohedra, and 

 combinations of both, are found. 



Chalcopyeite. — Small quantities in the mines of Seminole Hills and of 

 South Pass City. 



Chlorite. — In some of the granites of the Wind River Range. 



Coae. — Bituminous coal occurs in the Laramie and Wasatch Groups. 

 Is mined extensively at Rock Sr^rings, Evanston, and other localities. 



Corundum. — Small particles in some of the high granites of the Wind 

 River Range. 



Epidote. — Crystallized and massive in the metamorphic granites of the 

 Wind River Range. 



Glauberite. — In small quantities in some of the "alkali-flats" as efflo- 

 rescence. 



Gold. — In the Sweetwater Mines, Seminole Mines, and other localities. 

 In numerous gulches and in quartz veins. 



Gypsum. — Massive in the lower beds of the Triassic formation. Good 

 exposures found on the Little Popo-Agie. 

 Alabaster. — At the same locality, white, yellow, and red, either pure 



in color or veined. 

 Selenite. — Throughout the Wasatch shales and marls. Single and 

 twin crystals. Found in many shales, irrespective of groups. 



Halite. — Found in the alkaline efflorescences of dry lakes. 



Hematite. — Massive, red in the Palaeozoic rocks near Rawlings Springs. 

 Utilized as flux for ores and as red paint. 

 Fibrous. — At the same locality. 



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