338 Review of Algefs Phillips' Mineralogy, 



ide of copper, 46-8 ; crenic acid, 15-8 ;* water, 100 ; alumina and 

 iron, 4-4 ; carbonic acid and loss, 2*0 ; = 100-0. 



" It has the following characters. Forms stalactitical ; color blue- 

 green, when fresh, but greenish-white when dry. Specific gravity 

 1-88. Soft pulverulent when dry. 



" In the close tube gives off an abundance of water, when heated ; 

 the recent specimens giving the largest proportion. Heated to redness 

 a portion of the copper is reduced, and the mineral in the tube is found 

 to be a mixture of portions of copper with yellow and white powder. 

 Before the blowpipe, on charcoal, it first decrepitates a little, then shrinks, 

 leaving numerous cracks in it, and at last partially fuses and becomes 

 yellow and white. On being levigated, yields particles of metallic 

 copper. With soda, fuses, giving a button of copper. With acids, it 

 gelatinizes, and the solution is green and turns blue by excess of am- 

 monia. When mixed with water, and sulphydric acid gas is passed 

 through it, the copper separates as a sulphuret, and crenic acid and 

 silica may be obtained by evaporating the solution to dryness. The 

 crenic acid may be separated from the silica by a solution of carbonate 

 of ammonia. 



" It occurs in stalactites on the roof of the mine, and is continually 

 forming by infiltration through the porous sandstone rock. When re- 

 cently obtained, it contains a much larger proportion of water, which 

 it loses by exposure to dry air." 



The hydroborate oflime or borocalcite of Mr. Hayes, brought 

 by Mr. Blake from Tarapaca, Peru, is named Hayesine by Mr. 

 Alger, in honor of Mr. Hayes. 



The account below of Glauberite from Tarapaca is cited from 

 page 616. 



Glauberite. 



" This mineral was among the specimens brought by Mr. Blake, 

 from the province of Tarapaca, in Peru. From a qualitative examina- 

 tion, Mr. Hayes ascertained that it contained sulphuric acid, soda and 

 lime. He afterwards submitted it to analysis, and found it to be iden- 

 tical with glauberite. It gave him the following results : 



Sulphuric acid, - 

 Soda, ... 



Lime, ... 

 Protoxide of iron, 



99-668 



* With a small portion of phosphoric acid. 



