PHYSIOGRAPHY* 263 



Vivianite. 



dusty particles. Composition impalpable, earthy or easily 

 reduced to powder. 



1. When heated before the blow-pipe, it decrepitates, but if reduced 

 to powder, melts into a dark brown or black scoria, which affects the 

 magnetic needle. It is soluble in dilute sulphuric, and nitric acids. 

 The friable varieties are found white in their original repositories, but 

 like the white powder of the crystals, they soon assume a blue tinge, on 

 being exposed to the air. 



2. Analysis. 



By VOGEL. By THOMSON. By STROMEYER. 



fr. Bodenmais. fr. N. Jersey. fr. Cornwall. 



Protoxide of iron 41-00 . . 42-65 . . 4238 

 Phosphoric acid 2640 . . 24-00 . . 2869 

 Water 31-00 . . 25-00 . . 28-93 



3. It is found attending Iron Pyrites in copper and tin veins, in narrow 

 veins traversing greywacke with Native Gold, along with Magnetic 

 Iron, and in trap rocks. The compound friable varieties are imbedded 

 in clay, and in bog-iron ojre. 



4. It is found with Native Gold at Vorospatak in Transylvania, at St. 

 Agnes, Cornwall, and in Bodenmais;, Bavaria. The earthy variety is 

 found in Caiinthia, Stiria, and Thuringia, in the Shetland Islands, and 

 the Isle of Man. 



It occurs in considerable abundance at Allentown, Monmouth county, 

 (N. J.) and in its vicinity, imbedded in bog-iron ore, and associated with 

 clays : in the former instance, it is crystallized in nodules, as well as 

 massive; and in the latter, earthy. It is often found in this region fill- 

 ing up Belemnites and Gryphites, in the ferruginous sand formation. 



VOLKONSKOTTE. 



Massive ; divisible into laminae in one direction. 

 Color grass-green. 



1. When thrown into water, it falls to fragments with a hissing noise. 



2. It contains about 07 oxide of chrome. 



3. It is found in the district of Okhousk, Perm in Russia, where it oc- 

 curs in beds and veins. 



VULPINITE. (See Anhydrite.) 

 WAD. (See Pyrohsite.) 



