190 DESCRIPTIONS OF MINERALS. 



Wad, — Bog Manganese. 



Massive, renif orm or earthy ; also in coatings and dendri- 

 tic delineations. Color and streak black or brownish black. 

 Lustre dull, earthy. H.=;l-6. G.— 3-4. boils the lingers. 



Compositio)i. Consists of manganese dioxide, in varying 

 proportions, from 30 to 70 per cent., mechanically mixed 

 with more or less of iron sesquioxide, 10 to 25 per cent, of 

 water, and often several per cent, of oxide of cobalt or cop- 

 per. It is formed in low places from the decomposition of 

 minerals containing manganese. Gives off much water 

 when heated, and affords a violet glass with borax. 



Obs. AVad is abundant in Columbia and Dutchess coun- 

 ties, X. Y. 3 at Austerlitz, Canaan Centre, and elsewhere; 

 also at Blue Hill Bay, Dover, and other places in Maine ; 

 at Nelson, Oilman ton, and Grafton, X. H.; and in many 

 other parts of the country. 



It may be employed like the preceding in bleaching, but 

 is too impure to afford good oxygen. It ma} T also be used 

 for umber paint. 



Lampadite, or Cupreous Manganese. A wad containing 4 to 18 per 

 cent, of copper oxide. 



Triphylite. 



Trimetric. In rhombic crystals, massive. Color green- 

 ish gray to bluish gray, but often brownish black externally 

 from the oxidation of the manganese present. Streak 

 grayish white. Lustre subresinous. H. =5. G. =3*54-3*6. 



Composition. (iLi 2 |R) 3 O s P. 2 , in which R stands for Fe 

 and Mn. A Bodenmais specimen afforded Phosphorus 

 pentoxide 44*19, iron protoxide 38*21, manganese protoxide 

 5-63, magnesa ^39. lime 0*76, lithia 7-69, soda 0"74, pot- 

 ash 0*04^ silica 0*40 = 100*05. B.B. fuses very easily, color- 

 ing the flame a beautiful red. in streaks, with a pale bluish- 

 green on the exterior of the flame. Soluble in hydrochloric 

 acid. 



Obs. Found at Rabenstein in Bavaria; in Finland; at 

 Norwich, Mass.; Grafton, X. H. 



^ LitM 'philite. A salmon-colored manganese-lithium phosphate, al- 

 lied in composition to triphylite, but containing very little iron. 

 From Redding (near Branchviile Depot), Conn. 



