THE MINERALS OF IDAHO 237 



CUSTER COUNTY 



Smithsonite occurs sparingly in the Starr-Hope mine in the Copper 

 Basin district with iron oxide and partly oxidized galena. 55 The 

 zinc carbonate is common also in the oxidized lead-silver deposits 

 of the Bay Horse district where it has been found associated with 

 calamine and lead and copper carbonates in the Beardsley, Pacific, 

 Red Bird, and other mines. In the Beardsley mine sheaves of 

 calamine crystals rest upon druses of smithsonite and in the Red 

 Bird mine crystals of both calamine and fluorite rest upon crusts of 

 smithsonite. 50 



FREMONT COUNTY 



In the Birch Creek district smithsonite is a rare constituent of 

 oxidized ore of the Birch Creek mine, 10 miles southeast of Kauf- 

 man. 57 



In the Dome district a vein of comparatively pure smithsonite 

 crops out a short distance above the trail which joins the Johnson 

 property, 2 miles northwest of the Wilbert mine, from the east. 

 The smithsonite is exposed in a small pit only a few feet deep. The 

 vein is about 14 inches wide and is inclosed in magnesian limestone. 

 The smithsonite is yellowish gray in color and has a rough botryoidal 

 and drusy surface, but its distinguishing characteristic is its great 

 weight, which is 50 per cent greater than that of the adjacent lime- 

 stone. 58 



LEMHI COUNTY 



In Lemhi County smithsonite has been definiteh^ reported only 

 from the Texas district, where it is common in' oxidized lead-silver 

 ores as botryoidal linings in cavities and as stringers along joints, 

 particularly in the Pittsburgh-Idaho mine. Specimens from this 

 mine are illustrated by Umpleby. 59 



ARAGONITE (277) 



Calcium carbonate, CaC0 3 . Orthorhombic. 



.Aragonite is a dimorphous form of calcium carbonate having the 

 same composition as calcitc but differing in crystallization. It is 

 much less common than calcite, and has been found only as a rarity 

 in Idaho. 



ADAMS COUNTY 



Aragonite is listed by Livingston and Laney 60 as occurring in 

 Adams County in the Contact metamorphic copper deposits of the 

 Seven Devils district. 



« J. B. Umpleby. U. S. Oeol. Survey, Prof. Paper 97, p. 105, 1917. 



« J. B. Umpleby. U. S. Oeol. Survey, Bull. 539, pp. 68-72, 1913. 



»' J. B. Umpleby. U. S. Geol. Survey, Prof. Paper 97, p. 119, 1917. 



« J. B. Umpleby. U. S. Oeol. Survey, Prof. Paper 97, p. 117, 1917. 



" J. B. Umpleby. U. S. Oeol. Survey, Bull. 528, pp. 96 and 103, pi. 10, 1913. 



«• D. C. Livingston and F. B. Laney. Idaho Bur. Mines Oeol., Bull 1, p. 62, 1920. 



