PEROXIDE OF IRON, 

 iron-black. Lustre brilliant-metallic ; glassy 

 on cleavage face. Streak white or greyisb. 

 H. 5-5. S.G. 4-02v 



Comp. Titanate of lime, or Ca Ti = titanic 

 acid 59, lime 41 = 100. 



Analysis (mean of two), from Scbelingen, 

 by Seneca : 



Titanic acid .... 59-12 



Lime 36-81 



Water 6-11 



PETROL. 279 



Soda 2-30 



Litbia 2-69 



101-04 



BB alone, infusible. 



Localities. Achmatovsk, near Slatoust, in 

 tbe Ural, in crystals, or druses of crystals, 

 the largest of which do not exceed 6 lines 

 in length, associated with crystallized Chlo- 

 rite and Magnetic Iron, in Chlorite Slate. 

 Scbelingen, in the Kaiserstubl, in small 

 black cubes, with Mica, Magnetite, &c. 



Name. After Count L. A. von Perowski, 

 of St. Petersburg. 



Brit. Mus., Case 37. 



Peroxide of Iron. See Magnetite, 

 Martite, Hematite (Red Iron Ore, Spe- 

 cular Iron). 



Peroxide of Tin, Thomson. See Cas- 



SITERITE. 



Perthite, Thomson. A flesh- red va- 

 riety of Orthoclase from Perth, in Upper 

 Canada. S.G. 2-576 to 2-579. 

 Analysis, by T. S. Hunt : 



Silica ..... 66-44 

 Alumina .... 18"35 

 Peroxide of iron . . . 1-00 



Lime 6-67 



Potash 6-37 



Soda 5-56 



Magnesia . . . .0-24 

 Loss by ignition . . .0-40 



99-01 

 Brit. Mus., Case 29. 



VwiiXlAT,Haidinger,Hausmann. Petalite, 

 Phillips, Dana, Brooke §• Miller. Massive : 

 three cleavages ; structure perfectly lamellar 

 in one direction. Colour white, .greyish or 

 greenish ; frequently with a tinge of red. 

 Lustre glistening; pearly on the face of 

 perfect cleavage. Translucent. Streak 

 white. Fracture imperfect-conchoidal. H. 6. 

 S.G. 2-4 to 2-45. 



Comp. NaSi2 + 2LiSi2 + 4(AlSi6), or 



(Na + 2Li) si4 + 4AlSi6. 

 Analysis, from Uto, by Hagen 



Silica 

 Alumina 



77-81 

 17-20 



100-00 



BB fuses readily and quietly to a turbid 

 and rather blistered glass, colouring the 

 flame red, especially when powdered and 

 mixed with fluor-spar and bisulphate of 

 potash. 



Not afffected by muriatic or sulphuric acid. 



Localities. The iron mine of Uto, S. E. 

 of Stockholm, accompanied by Lepidolite, 

 Tourmaline, Spodumene and Quartz. Near 

 York, on Lake Ontario. Bolton, Massachu- 

 setts, U. S. Elba (var. Castor). 



Name. From rrsVaAov, a leaf, in allusion 

 to its lamellar structure in one direction, 



Petre Salt. Nitre in its native state 

 (see Nitre). When refined, it is called 

 salt-petre. 



Brit. Mus., Case 31. 



Petrol, Hatchett, Brochant. Petrole, 

 Petroleum. A blackish or reddish-brown 

 viscid variety of Asphaltum, containing 

 much Naphtha. Rather thicker than com- 

 mon tar. Generally translucent. Odour 

 strongly bituminous. Easily inflames, and 

 burns with a bluish flame, giving off a 

 thick black smoke, and leaving a very 

 small earthy residue. Soluble in ether and 

 alcohol. S.G. 0-7 to 0-85. 



Comp. CH2. 



Analysis, from Alsace, by Boussingault ; 



Carbon 8*8-7 



Hydrogen . . . .12-6 



101-3 

 Localities. — British. Cornwall ; at Huels 

 Unity and Jewel, and Carharrack. Chud- 

 leigh, Devonshire. Shropshire : Coal Port, 

 near Colebrook Dale, Madeley, Pitchford, 

 Peualley lead mine. Ormskii-k, Lanca- 

 shire. St. Catherine's Well, near Edin- 

 burgh. — Foreign. Tegernsee in Bavaria. 

 Near Neufchatel in Switzerland. Amiano 

 in Italy, and Pietra Bianca, on the south- 

 ern foot of Vesuvius. Sicily. Near tbe 

 volcanic isles of Cape de Verde, the sea 

 is sometimes covered with it. Parma. 

 Alsace in France, and at Beziers (Dep. 

 Herault), and Clermont (Puy-de-D6me). 

 Oil Creek, Venango co., Pennsylvania ; and 

 in Kentucky, Ohio, Virginia, &c., in the 

 United States. Inniskillen, Canada West, 

 where there is a deposit of Mineral Pitch, 

 or Mineral Caoutchouc, extending over 

 several acres, and also springs. The Ionian 

 Islands ; Zante, &c. Trujillo and Cumana 

 (Gulf of Cariaco). Antilles, In the provinces 

 T 4 



