LISTS OF SPECIMENS DISTRIBUTED. 



277 



Flexite (NaCaB50..,.6 HjO]. 

 [Crystallization — Unknown.] 

 IlLodes' Marsh, Esmeralda County, Nev. 33 



Gypsum [CaS04.2H,,01. 

 [Crystallization — Mouocliiiic] 

 This material is ground u]) and used as a torti- 

 lizcr known as "land plaster." 



Windsor, Kova Scotia. 34 



Pink Calcite [Ca(.!03]. 

 [Crystallization — Tlhoniboliedral.] 

 Franklin. Sussex County, N. J. 35 



Thermonateite [Na^HjCOi]. 



[Crystallization — Ortborhombic] 



This mineral, known commercially as crude 

 carbonate of soda, is used principally in the man- 

 ufacture of soap, glass, and paper. It is also 

 used in bleaching, dj-eing, calico i)rinting, the 

 manufacture of baking powders and washing 

 soda, and in many other chemical operations. 



Churchill County, Nev. 36 



Muscovite [Al3KH2(Si04)3]. 

 [Crystallization — Monoclinic] 

 This specimen contains beautiful dendritic in- 

 cIiLsiona of magnetite, FoaOj. 



Pennsbury, Pa. 37 



Chromite fFeCr.i04]. 

 [Crystallization — Isometric] 



This is the ore from which chromic acid and the 

 various salts of chromium are obtained. 



Webster, Jackson County, N. C. 38 



Beauxite [Al,Fe,03.2HiO]. 

 [Amorphous.] 

 Floyd County, Ga. 39 



Wern-erite [(CaNa.j)Al_,(Si()4)._,]. 

 [Crystallization — Tetragonal.] 



Bolton. Mass 40 



Pyrite [FeS.^]. 



[Crj-stallization — Isometric] 



This specimen contains a small quantity of 

 nickel, probably as sulphide, and is used as an 

 ore of nickel. 



Norway. 41 



Pyrrhotite [FerSg]. 



[Crystallization — Hexagonal.] 



This pyrrhotite is nickeliferous, and aflords 



mostof the nickel produced in the United Stales. 



Gap Mine, Lancaster County, Pa. 42 



Opal, var. Geyserite [SiO...A(i.]. 

 [Amorphous.] 

 This variety is dc^jiosited from the silicious 

 waters of geysers in caulillower-like and other 

 fantastic forms around the basins and the orifices 

 of eruption. It is frequently dejmsited in rounded 

 concretions and on roots, leaves, and limbs of 

 trees. 



Yellowstone National Park. Wyo. 43 



Calcite, var. C.vlcareous Tufa [CaCOj). 

 [Crys'allization — Ilhombohedral.] 

 Yellowstone National Park, Wyo. 44 



Zircon Crystals [ZrSiGjj. 

 [Crystallization^Tetragoual.] 

 The zircons of this locality arc extensively 

 mined, and used in the manufacture of the Wels- 

 bach incandescent gas-burner. 



Zircon Mines, Henderson County, N. C. 45 



PaiTlLE [TiO.^]. 

 [Crystallization— Tetragonal.) 



This mineral is used for giving the requi.site 

 tint in the manufacture of artiticial teeth. The 

 demand for it is on the increase, and in the year 

 1887 one thousand pounds of it were sold to m.anu- 

 facturers and specimen dealers. 



Swain (bounty, N. C. 4G 



Lepido.melane [R'6R"2AlsSi5024]. 

 [Crystallization — Monoclinic] 



This mica occurs at tliis locality in the rock 

 known as elceolite-syeuite. 



Litchfield, Me. 47 



Massive Topaz [A1.2Si04F2]. 

 [Crystallization — Ortborhombic] 

 Transparent portions of the topaz from this 

 locality have afforded small gems. 



Stoneham, Me. 48 



Yesuvianite [AljCas (Si04)7]. 

 [Crystallization — Tetragonal.] 



Woodstock, Me. 49 



Cancrinite [ Als(Si04)8(C04)2CaNa8H6l . 

 [Crystallization — Hexagonal.] 

 This mineral is heie associated with leiutiome- 

 lane, R'6R"2Al6Si-,02], in the rock known as 

 ela>olite-syenite. 



Litchfield, Mo. 60 



EL.EOLITE [Al8NasSi90:i4]. 



[Crystallization — Hexagonal.] 

 This mineral here occurs asthe chief ciuist it uent 

 of the rock eleeolite-syenitc 



Litchfield. Me. 51 



