1USILICATES. 247 



10 in circumference. White crystals occur at Canaan, Conn., 

 Kingsbridge, Xew York County, and the Sing Sing quarries, 

 Westchester County, N. Y. ; in Orange County at several 

 localities ; green crystals at Trumbull, Conn., at various 

 places in Orange County, ]\ r . Y., Roger's Rock and other 

 localities in Essex, Lewis, and St. Lawrence counties. Dark 

 green or black crystals are met with near Edenville, N. Y., 

 l)iana, Lewis County. Jeffersonite occurs at Franklin, in 

 X. J. Green coccolite is found at Roger's Rock, Long Pond, 

 and Willsboro', X.Y.; black coccolite, in the forest of Dean, 

 Orange County, X. Y. Diopside, at Raymond and Rumford, 

 Me., Hustis's farm, Phillipstown, N. Y. 



Pyroxene was thus named by Haiiy from the Greek pur, 

 fire, and xenos, stranger, in allusion to its occurring in lavas, 

 where, according to a mistake of Haiiy, it did not belong. 

 The name Augite is from the Greek auge, lustre. 



JEgerite. Black to greenish, black in color. It is a pyroxene con- 

 taining nearly 10 per cent, of soda, and much iron sesquioxide. From 

 near Brevig in Norway ; Hot Springs, Arkansas. 



Acmite. In long highly-polished prisms, or" a dark-brown or reddish- 

 brown color, with a pointed extremity, penetrating granite, near Kongs- 

 berg in Norway. 1 A 7=86° 56', resembles pyroxene. Contains over 

 12 per cent, of soda. Fuses easily before the blowpipe. 



Bdbingtonite. Resembles some varieties of pyroxene . It occurs in 

 greenish-black splendent crystals in quartz at Arendal in Norway. 



Uralite. Has the form of pyroxene but cleavage of hornblende. 



Rhodonite. — Manganese Spar, Fowlerite. 



Triclinic, but very nearly isomorphous with pyroxene. 

 Usually massive, the cleavage often indistinct. 



Color reddish, usually deep flesh-red ; also brownish, 

 greenish, or yellowish, when impure ; very often black on 

 the surface ; streak uncolored. Lustre vitreous. Transpa- 

 rent to opaque. Becomes black on exposure. H. =5-5-6-5, 

 G. =3-4-3-7. 



Composition. MnO ; , Si = Silica 45*9, manganese protox- 

 ide 54-1 = 100. It usually contains a little iron and lime 

 replacing the manganese. Becomes dark brown when heat- 

 ed, and. with borax in the outer flame, gives a deep violet 

 color to the bead while hot, and a red-brown wiien cold. 



Diff. Resembles somewhat a flesh-red feldspar, but dif- 

 fers in greater specific gravity, in blackening on long ex- 

 posure, and in the glass with borax. 



Obs. Occurs in Sweden, the Hartz, Siberia, and else* 



