MINERALOaiCAL APPENDIX. 



CONTENTS. 



A. — List of miuerals of Yellowstone Natioual Park 



B. — Analyses of volcanic rocks from Yellowstone National Park 



LIST OF MINERALS OF YELLOWSTONE NATIONAL PARK. 



By a. C. Peale, M. D. 



Agate. (See Quartz.) 



Alum. In springs of Hayden's Valley. 



Amethyst. (See Quartz.) 



Azurite (blue carbonate of copper). Near tlie head of Clarke's Fork of the Yellow- 

 stone River. 



Amphibole. Honiblende in acicular crystals in rocks on the summit of Mount 

 Washbume. 



Calcite (carbonate of lime). Bhomb spar, in the valley of the Yellowstone, below 

 mouth of Gardiner's Eiver, associated with quartz and chalcedony ; on 

 East Fork of Yellowstone River, in geodes of agate ; on bluff opposite 

 Mammoth Hot Springs, on Gardiner's River; at Promontory Point, Yel- 

 lowstone Lake. 

 Dogtooth spar (crystals), on volcanic rocks, near Mammoth Hot Springs. 

 Stalactites, in cave, at Mammoth Hot Springs. 



Camelian. (See Quartz.) 



Calcareous tufa. (See Travertine.) 



Chalcedony. (See Quartz.) 



Chalcopyrite (copper pyrites). Clarke's Fork of Yellowstone Eiver. 



Chrysoprase. (See Quartz.) 



Coal. A poor quality of lignite, opposite Mammoth Hot Springs, near Mount Han- 

 cock, on Hunters River. 



Feldspar. Sanidine, in various trachytes of the Park. 



Flint. (See Quartz.) 



Garnets. In gneissic rock, at Garnet Hill, near Elk Creek, in Junction Valley ; in 

 micaceous gneiss, on Blacktail-deer Creek ; in Yellowstone Valley. 



Galenite (suljjhide of lead). Clarke's Fork of Yellowstone River. 



Geyserite. (See Opal.) 



Gypsum (sulphate of lime). Selenite, in the bluff opposite Mammoth Hot Springs of 

 Gardiner's River ; in old hot spring deposits opposite Tower Creek, on Yel- 

 lowstone River. 



Hydrophane. (See Opal.) 



Halite (common salt). In small quantity in springs near Turbid Lake, east of Yel- 

 lowstone Lake. 



Hyalite. (See Opal.) 



Hornblende. (See Amphilwle.) 



Jasper. (See Quartz.) 



Malachite (green carbonate of copper). Clarke's I'"'ork of Yellowstone River. 



Obsidian (volcanic glass). In chips throughout the Yellowstone Valley,lrom the 

 lower canon to Yellowstone Lake. 

 Sphcrulitic, from Grand Canon of Yellowstone River; at Obsidian Mountain, 



near Beaver Lake ; and at numerous other points in the Park. 

 Porphijritic, from Grand CaiLon of the Yellowstone; divide between Yellow- 

 stone and Madison Rivers; at Obsidian Mountain. 



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