L62 On Tribadc Phosphoric Acid. 



phate in the year L818. We have to except, however, the Trip- 

 lite, a mineral that was analyzed in 1802, by Vanquelin. 



1801 L846. Pseudomdlachite, Karsten (Klaprolh K. Schrift. 

 Ber. < res. Nat. Frenude iii. 304). 



Hermann (J. pr. Ch. XXXYIL). 



Many minerals existed of this constitution which had been 

 analyzed before Hermann. 1 If was, however, the first to 

 analyze them all ami classify them. He heats to red heat, and 

 counting the loss as Mater, fuses with caustic soda. The residue 

 after washing is oxyd of copper. After testing the wash- 

 water for Al 2 3 and MnO, in their absence he calls the dif- 

 ference phosphoric acid. 



1. Tromboltthe, CuO 3, TO 5 2 + 6 IK), was first analyzed by 

 Plattner. 



II. PO 6 =41.00. 

 CuO=3 , ,>.20. 

 HO=16.80. 



2. Libethmite, Cu04, PO*+HO. 



(Cu0 4,P0 5 +HO) + (Cu0 4, PO r, + 2 HO). 

 CuO 1. P0 5 +2HO 

 is mentioned 1812 by Leonhardt (Leonhardt and Sclby's 

 Mineral. Stud.). Kulm analyzed it in L844, also Berthier and 

 Elermann. 



K. P0 5 =29.44 

 CnO=66.94 

 IK) 4.01 



B. PO B 28.70 

 OnO=63.90 

 BO= 7.40 



II. !'()'• 26.61 

 CuO 65.89 

 HO 5.50 



3. Tagilithe^uO^ P0 5 H 3 HO, analyzed first by Hermann 



