PYEOPHYSALITE. 

 Analysis, from Siberia, by Hermann : 

 Silica . . . . . 59-79 

 Alumina .... 29-46 

 Peroxide of irou . . .1-80 

 Magnesia .... 4-00 



Silver trace 



Water 5-62 



PYROSMALITE. 



309 



100-67 



BB infusible, but exfoliates into white 

 leaves, and increases to about twenty times 

 its original size. 



Partly soluble in sulphuric acid. 

 Localities. Between Pyschminsk and Bere- 

 sow, in the Ural. Westana, Sweden. Cot- 

 tonstone Mountain, New Carolina, U.S. 



Name. From ^y^fjire, and (pv>i>^v, a leaf; in 

 allusion to its behaviour before the blowpipe. 

 Brit. Mus., Case 32. 



Pykophysalite, Hisinger. A coarse and 

 nearly opaque variety of lopaz, found occa- 

 sionally in yellowish-white crystals of con- 

 siderable dimensions, at Finbo and Broddbo, 

 in Sweden. A single crystal in the College 

 of Mines at Stockholm weighs 801bs. 



Name. Derived from ^v^,fire, and (?i>trxeo^ 

 to blow: has reference to the manner in 

 which it swells up when heated. 

 Brit. Mus., Case 68. 



Pyeopissite, Kengott. A Mineral Resin, 

 resembling earthy Brown Coal in appear- 

 ance, forming a layer six to eight inches 

 thick in Brown Coal at Weissenfels, in 

 Prussia. It is of an opaque, dull yel- 

 lowish-brown colour, with a shining and 

 greasy streak, and an earthy fracture. S.G. 

 U-49 to 0-52. 



Burns like Bitumen, with a brownish - 

 yellow flame and a weak aromatic odour. 

 Largely soluble in sulphuric acid. Affords 

 on distillation 62 per cent, of paraffine. 



Pyrorthite, Berzelius. Probably a de- 

 composed Orthite, containing bituminotts 

 matter. H. 2-5. S.G. 2-19. 



Locality. Kararfvet, near Fahlun, in Swe- 

 den, associated with Gadolinite, in granite. 



Name. From ^v°, fire, and Orthite : be- 

 cause if gently heated on one side it takes 

 fire and burns (without either flame or 

 smokej. 



Brit. Mus., Case 38. 



Pyrosclerite, or Pyrosklerite, v. Ko- 

 helL Massive ; foliated and fibrous. Perfect 

 basal cleavage. Colour apple-green, pale 

 greenish - grey, or reddish. Translucent. 

 Lustre dull ; pearly on cleavage planes. Sec- 

 tile. Fracture uneven and splintery. H. 2-5 

 to 3. S.G. 2*74. 



Comp. 2Mg Si + Al Si + 4H = silica 37*6, 

 alumina 14-2, magnesia 33-2, water 14-9 = 100. 

 Analysis, from Elba, by v. Kobell : 



Silica 37-03 



Alumina .... 13-50 

 Oxide of chrome . , . 1-43 

 Protoxide of iron . . . 3-52 

 Magnesia .... 31-62 

 Water ..... ILOO 



98-10 



BB fuses with difficulty to a grey glass : 

 with borax yields a glass-coloured green by 

 chromium ; and with solution of cobalt, a 

 greyish mass. 



Decomposed, in the state of fine powder, 

 by concentrated muriatic acid, with separa- 

 tion of silica, though not in a gelatinous 

 state. 



Localities. Elba, with Chonikrite. Aker, 

 in Slidermanland : S.G. 2-605. 



Name. From ^v?, fire, and o-zy^yifo^, hard; 

 in allusion to its refractory comportment be- 

 fore the blowpipe. 



Descloiseaux considers Pyrosclerite to be 

 a mixed mineral. Scheerer joins Pyroscle- 

 rite with Chonikrite. 



PYROsiDEiiiXE (from ^^?,fire, and ^^/S-zj^e?, 

 iron). A variety of Gothite from Eiserfeld, 

 in Nassau. 



Comp. Fe H. 





Analysis, by v. Kobell : 





Peroxide of iron . 



. 86-35 



Peroxide of manganese 



. 0-51 



Silica .... 



. 0-85 



Oxide of copper . 



. 0-91 



Lime .... 



. trace 



Water 



. 11-38 



lOU-00 

 Pyrosmalite, Hausmann. Pyrosma- 

 LiTH, Karsten. Hexagonal. Occurs in six- 

 sided prisms, of which the terminal edges 

 are sometimes replaced ; with a perfect basal 

 cleavage ; also massive. Colour liver- 

 brown or pistachio-green : generall}' jqI- 

 lowish - brown without, greenish - yellow 

 within. Translucent at the edges. Lustre 

 of the terminal planes pearly ; of other planes 

 shining. Structure lamellar. Streak green, 

 paler than the colour. Rather brittle. Frac- 

 ture uneven and somewhat splintery. H. 4 

 to 4-5. S.G. 3-081. 



Comp. (Fe, Mn)3 Si2 + (Fe2 CP + F^e 6H). 



Analysis, by Hisinger : 



Silica 35-85 



Peroxide of iron . . . 35-48 

 x3 



