102 PHYSIOGRAPHY. 



Pharmacolite. 



Cleavage, parallel to P highly perfect, and easily obtain- 

 ed. Fracture uneven. Surface, faces P and n are deeply 

 streaked parallel to their common edges of combination. 



Lustre vitreous. P slightly inclining to pearly, both upon 

 faces of cleavage and of crystallization. Color white, in- 

 clining to yellowish. Streak white. Transparent, or trans- 

 lucent. 



Sectile. Thin laminae are flexible in a direction per- 

 pendicular to the edges between T, n and P. 



Hardness =2-0 . . . 2'5, nearer the latter. The perfect 

 faces of cleavage are below 2-0. Sp.gr. =2-730. 



Compound Varieties. Globular aggregations of acicu- 

 lar crystals. Reniform, botryoidal and stalactitic shapes. 

 Composition thin columnar . . . impalpable. Farinaceous. 



1. The crystals above described, were first observed upon a specimen 

 whose locality is unknown, associated with the Haidingerite, but have 

 since been discovered at Wittichen. 



2. Before the blow-pipe, it emits an arsenical odor, and melts with 

 difficulty into a white enamel. It is dissolved in nitric acid without ef- 

 fervescence. 



3. Analysis. 



By KLAPROTH. By JOHIV. By TURISTER. 



fr. Wittichen. fr. Andreasberg. 



Lime . 25-00 . 27-28) 76<92 



Arsenic . 50 54 . 45-68 5 



Water 24-46 23-86 27-08 



4. It is found in the principality of Fiirstenberg, at Andreasberg in the 

 Hartz, at Riechelsdorf inHessia, and other places, in veins that also con- 

 tain Native Arsenic and Smaltine. 



5. The description of the Pier ophar mac olite does not differ from that 

 given above of the Pharmacolite. The only difference consists in a 

 imall quantity of magnesia, 3-218 p. c., which the former contains. It 

 comes from the cobalt mines of Riechelsdorf in Hessia, 



PHARMACOSIDERITE. (See Cube-Ore.) 



