ENDLicH.] CATALOGUE OP COLORADO MINERALS. 145 



Hessitb, Auriferous. — Genth has published * three analyses. One 

 of these gives the following results : 



Per cent. 



Quartz 0.70 



Gold 13.09 



Silver 50.56 



Copper 0.07 



Lead 0.17 



Zinc 0.15 



Iron 0.36 



Tellurium - 34.91 



100. 01 



Heulandite. — Small crystals in basalt near TJucorhpahgre Park. 



HiTCHCOCKiTE. — See Plumbogummite. 



Hornblende, — See Amphibolite. 



Hyalite. — See Opal. 



Hypersthene. — In some of the dikes of the Front Eange. 



Idocrase. — See Vesuvianite. 



lODYRiTE. — A small fragment was found in some surface ore from the 

 Bed Cloud Mine, Gold Hill. 



Iron. — Native in the Colorado meteorite found in 1866. 



ISERiTE. — Chug Water. 



Jamesonite. — Sweet Home Mine, San Juan. Summit district, near 

 Del Norte. 



Jarosite. — On the dumps of the Wood Mine, Leavenworth Gulch, near 

 Nevada. 



Jasper. — See Quartz. 



Jet. — Wet Mountain Yalley, Trinchera Mesa, Southeast Colorado. Oc- 

 curs in narrow seams in most of the coal-bearing beds. 



Kalinite. — See Alum. 



Labradorite. — Near Golden, in the dolerites. Near Fair Play, in. the 

 trap-rock. In the dolerites of Colorado, generally. No good crys- 

 tals. 



Lanarkite.— (Mine unknown, but probably in South Park.), 



Lead. — Native in Hall Gulch, Summit County. At Breekenridge. An 

 announcement of native lead must always be received with necessary 

 caution. The small specimen owned by Professor SchLrmer I have 

 seen, but although it had a very " natural" appearance, I was unable 

 to decide. 



Lepidolite. — Eito Alto Peak, in a form resembling the Saxon zinn- 

 waldite. 



Leucite. — Table Mountain, Golden City. 



Leucopyrite. — Spanish Bar. 



Lignite. — Mouth of Gunnison. There it retains its wood structure. 



LiMONiTE. — In the Tertiary sandstone, west of Plum Creek, near Col- 

 orado City; in several localities of South Park. At the head of South 

 Fork of Anthracite Creek, west slope of Sangre de Cristo Eange,. 

 above Mosco Pass. Numerous localities in White Elver region. The 

 "kidney-ores" of lignitic group. Pseudoinorphous after pyrite crys- 

 tals at Central, Gilpin County. 



LiONiTE. — From the Mountain Lion Mine, Magnolia district. Professor 

 Genth furnishes two analyses of the mineral.+i 



* Rep. U. S. Geol. Surv., 1873, p. 689-. 



tZe.itschr. ftir Kryst. uod Min., P. Groth, vol. II, No. 1, 1877. It is essentially a 

 modification of tellurium {q. v.), and is intimately associated with quartz. 



10 G 



