358 GEOLOGICAL SURVEY OF THE TEREITORIES. 



Fire-clay. — Golden, Ealston, Boulder, &c., S. 



Float-stone. — Mammoth lode, Central, S. 



Flos ferei. — Vide Aragonite. 



Fluorite. — Terrible mine, Georgetown, in light-green cubes ; in small 

 crystals and massive, of violet color, on Mount McClellan and Gray's 

 Peak, E. On Bear Creek, S. ; massive, pink and violet in the Sweet 

 Home mine, Peters. 



Galenite. — In narrow seams, fine-grained, Winnebago ; feathery in the 

 Dallas mine; coarse-grained in the J. P. Whitney, Running, Monte 

 Christo, Forks, and other mines of Gilpin County. In the Colorado 

 Central, Equator, Star, Pelican, Terrible, and others it occurs in large 

 quantities. The Cold Stream shows beautiful crystals, combination 

 of cube and octahedron, with rarely the rhombic dodecahedron. The 

 International, at an elevation of about 12,800 feet, has a heavy vein 

 of galenite. The No Name, Caribou, Fourth of July, and other mines 

 in Boulder County contain the mineral. The Silver HiU mines (fine- 

 grained) and the Eosita mines in Hardscrabble district. On station 

 46, E, Hamilton, the mines around Fairplay show crystals ; the mines 

 of Elk Mountain district, the head of Iowa and of Empire Gulch 

 contain galenite. In small scattering quantities it is found almost 

 throughout the country, P. 



Garnets. — Crystallized in rhombic dodecahedra and sometimes ikosi 

 tetrahedra ; found together with epidote in the dike on Gunnell Hill 

 Closely resemble the garnets from Auerbach, in Germany. In mica 

 schist at camp 14 and at station 22, E. On Trail Creek, Bergen, &c. 

 S. Monifgomery, Peters. 



Gold. — Native gold in very small and indistinct crystals in the Bob 

 tail, Gunnell, Quartz Hill, near Central, E. Tarryall Creek, Placer 

 Diggings, near Fairplay, in imperfect crystals and laminse ; in Wash 

 ington and California Gulches, in the Placers of Union Park, and 

 numerous other localities, P. Occurring as the result of decomposi 

 tion of the tellurids at Gold Hills, M. Lately discovered native in 

 large quantities, though very minutely distributed, in the quartz 

 ledges of the San Juan mining-district. 



Goslarite. — On the =dumps of the Wood lode, Leavenworth Gulch 

 near Central, E. 



Graphite. — Trinidad mine. Las Animas County, Sch. 



Greenocrite. — On sphalerite of the Dallas mine, Black Hawk, E. 



Gypsum. — Is distributed very widely throughout the Cretaceous forma- 

 tion of Colorado. Good crystals are rare. Selenite is the usual form 

 of its occurrence, frequently being found in twins. 



Halite. — Salt-works of South Park, along some parts of the Platte 

 Eiver in springs, P. Found as salt-licks in various parts of the Ter- 

 ritory. 



Hematite. — Specular, on Procer Hill, Central, E. Head of Bear Creek ; 

 fibrous and specular in Philipps mine, Silver Hills ; in the mines of 

 Elk Mountain district ; micaceous on station 65 ; on Sopris Peak, P. 



Henryite, n. sp. — Eed Cloud mine. Gold Hill, Sch. and M. Cold Spring 

 mine, M. 



Hitchcockite. — On copper minerals of the Dallas mine, Black Hawk, 

 E. 



Hornblende. — Occurs in numerous localities in the dikes, so that it 

 would be useless to enumerate them. Good crystals none were found. 

 Eadiated on station 43, E. 



Hyalite. — On stations 33 and 34 in trachyte, E. At the Hot Sulphur 

 Springs of Middle Park, S. 



