184 DESCRIPTIONS OF MINERALS. 
Obs. Occurs in granite at Bodenmais in Bavaria, and 
also in Bohemia. In the United States, it is found in gra- 
nitic veins, at Middletown and Haddam, Conn. ; at Ches- 
terfield and Beverly, Mass.; at Acworth, N. H.; Green- 
field, N. Y. A crystal was found at Middletown, which 
originally weighed 14 pounds avoirdupois ; and a part of it, 
6 inches in length and breadth, weighing 6 Ibs. 12 0z., is now 
in the collections of the Wesleyan University of that place. 
Also at Standish, Maine; and in granite veins in North 
Carolina. 
This mineral was first made known from American speci- 
mens, by Mr. Hatchett, an English chemist, and the new 
metal it was found to contain was named by him columbium. 
Tantalite. FeMn)O,Ta,. This tantalate of iron is allied to colum- 
bite. H. 6-6:°5. G. 7-8. It is distinguished by its higher specific 
gravity. It sometimes contains tin and tungsten. From Finland, 
Sweden, near Limoges in France, and from North Carolina ana 
-Alabama. 
Note.—The metal named Columbium by Hatchett, is the same that 
has since been called Niolium, without any good reason for the change 
of name. . 
Triphylite. An iron manganese-lithium phosphate. See p. 190. 
Vivianite.—Hydrous Iron Phosphaice. 
Monoclinic. In modified oblique prisms, with cleavage 
in one direction highly perfect. Also radiated, reniform, 
and globular, or as coatings. 
Color deep blue to green. Crystals usually green at right 
angles with the vertical axis, and blue parallel to it. Streak 
bluish. Lustre pearly to vitreous. Transparent to translu- 
cent; opaque on exposure. Thin lamine flexible. H.= 
io. 1G = 2°66. 
Composition. Fe; O, P,+8aq = Phosphorus pentoxide, 
28°3, iron protoxide 43:0, water 28°7=—100. B.B. fuses 
easily to a magnetic globule, coloring the flame greenish 
blue. Affords water in a glass tube, and dissolves in hydro- 
chloric acid. 
Diff. The deep blue color and the little hardness are 
decisive characteristics. The blowpipe affords confirma- 
tory tests. 
Obs. Found with iron, copper and tin ores, and some- 
times in clay, or with bog iron ore. St. Agnes in Cornwall, 
Bodenmais, and the gold mines of Voréspatak in 'Transylva- 
nia, afford fine crystallizations. In the United States, good 

