212 



METALS. 



Dif. The crystals, in general, by their thin wedge shapa, 

 readily distinguish this species when crystallized ; biu some 

 crystals are very complex. From garnet, tourmaline, and 

 idocrase, this species is distinguished by its infusibility beforo 

 the blowpipe. 



Obs. Sphene occurs mostly in disseminated crystals in 

 granite, gneiss, mica slate, syenite, or granular limestone. It 

 is usually associated with pyroxene and scapolite, and often 

 with graphite. It has been found in volcanic rocks. The ■ 

 crystals are commonly \ to £ an inch long ; but are some- 

 times 1 to 2 inches. 



Foreign localities are Arendal in Norway ; at St. Gothard 

 and Mount Blanc ; in Argyleshire and Galloway in Great 

 Britain. 



In the United States, it is met with in good crystals in 

 New York, at Rogers' Rock on Lake George, with graphite 

 and pyroxene, at Gouverneur, near Natural Bridge in Lewis 

 county, (the variety called lederite,) in Orange county in 

 Monroe, Edenville, Warwick, and Amity, near Peekskill in 

 Westchester county, and near West Farms. In Massachu- 

 sets, at Lee, Bolton, and Pelham. In Connecticut, at Trum- 

 bull. In Maine, at Thomaston. In New Jersey, at Frank- 

 lin. In Pennsylvania, near Attleboro', Bucks county. In 

 Delaware, at Dixon's quarry, 7 miles from Wilmington. In 

 Maryland, 25 miles from Baltimore, on the Gunpowder. 



Greenovite is a sphene containing manganese. 



Perofskite. This is a titanate of lime. It occurs in minute modified 

 cubes, grayish to iron-black in color. Gr=4*0l7. H=5-5. From the 

 Urals. 



Pyrrhite. In minute regular octahedrons, of a yellowish color. 

 Transparent ; vitreous. H=6. From near Mursinsk, Siberia ; also 

 from the Western Islands, as first detected by Mr. J. E. Teschemacher 

 of Boston. Supposed to contain titanic acid. 



Keilhauite, or yttro-titanite. Related to sphene. Brownish-black, 

 with a grayish-brown powder. Gr=369. H=6 5. Fuses easily. 

 Contains silica 300, titanic acid 29-0, yttria 9*6, lime 18 - 9, peroxyd of 

 iron 6-4, alumina 61. From Arendal, Norway. 



Warwickite. It occurs in prismatic crystals, of a brownish to an iron- 

 gray color, often tarnished bluish or copper-red. Luster metallic pearly 

 to imperfectly vitreous or resinous. H=5 — 6. Gr=3 — 3 - 3. Infusible 

 alone before the blowpipe. From magnesian limestone, with ilmenite 

 and spinel, at Amity, Orange county, N. Y. 



What are distinctive characteristics of the species sphene ] In what 

 rocKs does it occur 1. 



