PHYSIOGRAPHY. 61 



Native Antimony Native Arsenic. 



Compound Varieties. Reniform ; surface reniform or 

 uneven ; composition of flat grains collected into curved or 

 lamellar. Massive ; composition granular, of various sizes 

 of individuals, easily separated; faces of composition stri- 

 ated agreeably to the faces of cleavage. 



1. Before the blow-pipe, it melts quickly into a globute, and contin- 

 ues to burn when heated to redness, even if the blast is suspended. It 

 emits copious white fumes, which are deposited round the globule : first 

 yellowish-white octahedrons, probably of antimonious acid, are formed, 

 and then snow-white prismatic crystals of oxide of antimony, with which 

 at last, the whole globule is covered. Some of the varieties leave a 

 globule of silver when the contents of antimony have been entirely vol- 

 atilized. It crystallizes readily from fusion. 



2. Analysis. 

 By KLAPROTH. 



Antimony 98-00 



Silver 1-00 



Iron 025 



8. Native Antimony is found in veins traversing ancient rocks, and is 

 principally accompanied by other species that contain antimony. The 

 Antimony Ochre, which occurs with it, seems to be the product of its 

 decomposition. 



4. The present species was first discovered at Suhlberg, near Sahla 

 in Sweden, and afterwards at All<-mont in Dauphiny, where it occurs in 

 curved lamellar compound varieties, which consist of granular ones, and 

 at Andreasberg in the Harlz. It is likewise found in primitive moun- 

 tains, attended by Grey Antimony and Galena ; at San Han Huetamo, 

 and Cuencame, in Mexico. 



NATIVE ARSENIC. Arsenic Melacone-Metal. 



Primary form. Rhomboid. P on P=114 26'. 



Cleavage, imperfect, parallel with P. 



Lustre metallic. Color tin-white, a little inclining to 

 lead-grey, very soon tarnished dark-grey on being exposed 

 to the air. Streak unchanged, rather shining. 



VOL. II. 6 



