42 PHYSIOGRAPHY. 



Arsenic-glance. 



The Flos-ferri has been met with at Lockport, (N. Y.) coating gypsum 

 in geodes, at Edenville, (N.Y.) lining cavities of Mispickel and Cube ore, 

 and at Haddam, (Con.) and its vicinity, in thin seams between layers of 

 gneiss. A fibrous variety occurs at Scoharie, (N.Y.) It also exists in 

 numerous limestone caves of the south western states. 



. ARSENIATE OF COBALT. (See Cobalt-Bloom.} 

 ARSENIATE OF COPPER. (See Jlphanesite, Copper-Mica , 



Erinite, Euchroite, Liroconite and Olivenite.) 

 ARSENIATE OF IRON. (See Cube-ore.) 

 ARSENIATE OF LIME. (See PharmaJcolite.) 

 ARSENIATE OF NICKEL. (See Nickel- Ochre.) 



ARSENICAL ANTIMONY GLANCE. 



In reniform masses, consisting of thin and curved individuals. 

 Fracture uneven. 



Lustre shining to faint. Color tin-white to steel-grey. 

 Hardness = 2-0... 3-0. Sp. gr. =6-2. 



1. Before the blow-pipe it melts, and during fusion emits fumes of An- 

 timony and Arsenic. Decomposed by nitric acid, affording a white pre- 

 cipitate, soluble in muriatic acid. 



2. It is found at Przibram in Bohemia, Allemont in.Dauphiny, Poul- 

 laouen in Brittany, and Andreasberg in the Hartz. 



ARSENIC-GLANCE. 



Massive, botry oid al; composition columnar, individuals radia- 

 ting. 



Lustre metallic. Color dark lead-grey. 

 Hardness = 20... 2-5. Sp. gr. = 5-2 . . . 5-5. 



1. Fragments of it, held in the blaze of a lamp, take fire, and dissem- 

 inate, amidst continual sparks, a greyish, arsenical vapor. Heated on 

 platina foil, it is surrounded by a ring of crystallized arsenic acid ; and 

 as it diminishes perceptibly, the vapor is partly deposited in the form of 

 a blackish-grey powder. Before the blow-pipe, upon charcoal, it burns, 

 at first with a bluish flame, and disappears in a dense smoke. It does 

 not melt, until just before it disappears, when a white metallic globule 

 is obtained. In the matrass it gives, at first crystallized arsenic acid : 

 afterwards, a grey smoke and metallic arsenic, without any perceptible 

 residuum. It is soluble in nitric acid, and the solution (when the acid is 



