246 PHYSIOGRAPHY. 



Tourmaline Triplite. 



perfect at both extremities. A cinnamon-red, and brown variety occurs 

 at Governeur, St. Lawrence co., (N. Y.) in granular limestone with 

 Scapolite, Pyroxene and Apatite, though it is chiefly imbedded by itself 

 in veins of white Quartz. A similar variety is found at Grenville, Low- 

 er Canada, Newton, (N. J.) with Corundum, Spinel and Rutile, at 

 Kingsbridge, (N. Y.) and at Carlisle, (Mass.) with Garnet. Black va- 

 rieties are found at numerous places. The most beautiful have been ob- 

 tained from Brunswick, (Me.), Monroe and Haddarn, (Conn.) and Green- 

 field, (N. Y.) 



6. The red varieties of Tourmaline are highly esteemed in jewellery ; 

 when they are transparent and of a fine color, they rank on a level with 

 the oriental ruby. The green and blue varieties are also cut when their 

 color is not too intense. 



TREMOLITE. (See Hornblende.) 

 TRICLASITE. (See Fafdunite.) 



TRIPLITE. Prismatic Par ach rose-Bary te. 



Massive : cleavage in three directions perpendicular to 

 each other, one of them more distinct. Fracture small 

 conchoidal. 



Lustre resinous, inclining to adamantine. Color black- 

 ish-brown. Streak yellowish-grey. Translucent on the 

 edges. Opake. 



Brittle. Hardness = 5-0 ... 5-5. Sp. gr. =3-439 . . . 

 3-775. 



1. Before the blow-pipe, it melts easily into a black scoria, and is 

 readily dissolved in nitric acid without effervescence. 



2. Analysis. 

 By VAUQUELIIV. 



Chfideofiron 31-00 



Oxide of manganese 42-00 



Phosphoric acid 27 00 



3. It has been found near Limoges in France, in a vein of Quartz in 

 granite, accompanied by Apatite. In the United States, it occurs in con- 

 siderable quantity at Washington, (Conn.) where it exists as at Limoges 



