320 BULLETIN 131, UNITED STATES NATIONAL MUSEUM 



CLARKE COUNTY 



Several good topaz crystals, colorless, and pale yellow prisms up 

 to 7 mm. in diameter are reported to have been found by Mr. C. A. 

 McCafferty, of Ideman, on Camas Creek. 44 



IDAHO COUNTY 



A clear bluish topaz of great size was found in gold-bearing gravel 

 on a tributary to Paddy Creek in the Warren district. 45 



ANDALUSITE (398) 



Aluminium silicate, AUCVSiC^. Orthorhombic. 



The following localities for andalusite in Idaho have been reported : 



BLAINE COUNTY 



Andalusite occurs as small grains and crystals as a contact mineral 

 in metamorphosed shales at the contact of the large granitic mass 

 west of Hailey in the Wood River district. 46 



LEMHI COUNTY 



Andalusite (chiastolite) is reported to occur with garnet and am- 

 phibole in metamorphosed Algonkian sedimentary rocks in Lemhi 

 County. 47 



SHOSHONE COUNTY 



In the metaporphosed rocks surrounding the quartz-monzonite 

 batholith of the Coeur d'Alene mining district andalusite is developed 

 in some of the more aluminous beds of the Prichard formation in close 

 proximity to the contact. This mineral forms prismatic knots a few 

 millimeters long in a black metamorphosed slate, derived from the 

 Prichard, near the monzonite contact on the Dobson Pass road, but 

 although present in many other localities this mineral is not elsewhere 

 conspicuous megascopically because of its occurrence in small irregular 

 individuals without crystal form. Where it is abundant, however, it 

 gives the rock a pinkish tinge. 48 



VALLEY COUNTY 



Andalusite occurs in the Yellow Pine quicksilver mining district 

 in Valley County. The original sandstones and quartzose conglom- 

 erates have been altered to hard quartzites and the less pure sand- 

 stones to quartz schists. A specimen of the schist collected as typical 

 of the thick layer on the ridge southwest of the Smith camp proved 



m H. T. Stearns. U. S. Qeol. Survey. Oral communication. 



« Waldemar Lindgren. U. S. Geol. Survey, 20th Ann. Rept., pt. 3, p. 243, 1900. 



<« Waldemar Lindgren. U. S. Geol. Survey, 20th Ann. Rept., pt. 3, p. 195, 1900. 



« J. B. Umpleby. U. S. Qeol. Survey, Bull. 528, p. 31, 1913. 



48 F. L. Ransome and F. L. Calkins. U. S. Geol. Survey, Prof. Paper 62, p. 50, 1908. 



