MINERALOGY. 



553 



VIII. OE- 



Pritmatlc 



titanium 

 re. 



Oryrtogno. Constituent Paris Silica, 25,80; Yttria, 45.0; 

 - T - Oxide of Cerium, 16.69; Oxide of iron, 10.26; Vola- 

 V-yW tile matter, O.CO. = 98.35. Br.rzeliut. 



Geognostic and Geographic Situation. Occurs in beds 

 of felspar in mica-slate, at Ytterby near VVaxholm in 

 Roslngen, and in granite at Finbo near Fahlun, in 

 Sweden. 



OBDEE VIII. ORE. 



If metallic, the colour is dark. If not metallic, lus- 

 tre adamantine, or imperfect metallic. If the streak is 

 yellow or red, the hardness = 3.5 and more. If the 

 specific gravity = 4.8 and more, and the streak brown, 

 or black, the hardness = 5. and more, or very perfectly 

 prismatoidal. Hardness =. 2.6 7. If +-5 and 

 less, the streak is red, yellow, or black. If 6.5 and 

 more, and white streak, the specific gravity = 6.5 and 

 more. Sp. gr. = 3.4. 7.4. 

 TITABIC* GENUS I. TITANIUM ORE. 



Pyramidal, prismatic. Hardness = 5.0, 6.5. Sp. 

 gr. = 3.4, 4.4. If less than 4.2 streak is white. 



I. PRISMATIC TITANIUM ORE, or SPHENE, Jameson. 

 I'risnutuches Titan-erz, Moh*. 



Vertical prism = 136 SO*. Horizontal prum in the 

 direction of one of the diagonals, = 120". Streak white. 

 Hardness = 5.0, 5.5. Sp. gr. = 3.4, 3.6. 



This species is divided into two subspecies, viz. Com* 

 mon Sphene and Foliated Sphene. 



FIRST SUBSPECIES. 



COMMON SPHENE, Jameton. Braun Manakerz, Wtr- 

 ner. Titane Siliceo Calcnire, Unity. 



External Character*. Colours brown, green, grey, 

 and white. Occurs in granular distinct concretions, 

 and crystallized in oblique four-sided prisms, variously 

 modified by bevelmentu, truncations, and acuminations. 

 Internally shining or glistening ; lustre adamantine, 

 sometimes inclining to resinous, sometimes to vitreous. 

 Fracture imperfect conchoidal, which inclines to un- 

 even. Alternates from opaque to translucent. 



St. Gothard. 



Conttiluent Parit. Oxide of Titanium, S3.S 

 Silica, . .280 



Lime, . 32.2 



Water, . . 093.5 



Cordier in Jour, det Mines, N. 78. 70. 



(ifofnottic and Geographic Situation*. It occurs in 

 small and very small crystals, imbedded in the syenite 

 of the Criffle and others hills in Galloway ; in the sye- 

 nite of Inverary ; and in various other quarters in Scot- 



y -<! .; 

 imHiai 

 TKaBNua 



SECOND SUBSPECIES. 



FOLIATED SPHENE, Jamison. Gelb Manakerz, 

 Bfr . Titane siliceo-calcaire, Hauy. 



External Character*. Colours yellow, brown, and 

 grey. Occurs massive, in straight lamellar concretions, 

 ana crystallized in the same figures as the preceding 

 subspecies. Lustre on the cleavage splendent or shin- 

 ing ; on the imperfect conchoidal and uneven fractures 

 only shining or glistening, and resinous. Fracture im- 

 perfect cnnchoidal, inclining to uneven. Translucent, 

 or only translucent on the edges. 



Gfognottic and Geographic Situation*. Occurs in 

 primitive rocks in Italy, Bohemia, Norway, and other 

 countries. 



"' '' I "^ MAT -P'' R A' I DAL TITANIUM-ORE, Jameson. 

 ' ;'vraniidales Titan-erz, Moh*. 



"d- Pyramid = 117 2*; 84 48'. Most dis- 

 tinct cleavage in the direction of the later*! planes of 

 thi- rectangular four-sided prism ; and another less dis- 

 tinct, parallel with the diagonals of the prism. Streak 

 brown. Hardness =; 6.0 -6.5. Sp. gr. = 4.2 4.4. 



TOL. XIT. PABT II. 



Icerine. 



This species is divided into three subspecies, viz. Ru- Oryctogno- 

 tile, Iserine, and Menachanite. v*-^^ 



FIRST SUBSPECIES. 



RUTILE, Jiimeson. Rutil, Werner. Titane Oxide, Rutile. 

 Hauif. 



External Characters. Colours brown, red, and yel- 

 low. Occurs massive, disseminated, in membranes, and 

 in four and six-sided prisms. Internally the lustre is 

 intermediate between adamantine and semi-metallic, 

 and is splendent on the surface of the cleavage, but on- 

 ly shining or glistening in the conchoidal or uneven 

 fractures. Fracture uneven and conchoidal. Streak 

 brown. Transparent or only translucent on the edges. 



Geognottic and Geographic Situaiiont. It is found 

 imbedded, in veins and in drusy cavities, in granite, 

 syenite, gneiss, mica-slate, limestone, chlorite-slate, and 

 hornblende slate, in Scotland, England, and in various 

 countries on the continents of Europe, Asia, and Ame- 

 rica. 



SECOND SUBSPECIES. 

 ISERINE, Jameson. Iserin, Werner. 



External Character*. Colour iron-black, inclining to 

 brownish-black. Occur* in rolled pieces. Internally 

 it alternates from splendent to glistening, and the lustre 

 is metallic. Fracture more or less perfect conchoidal. 

 It is completely opaque. 



Constituent Part*. Oxide of Titanium, 28 



Oxide of Iron, . 72100 

 Klaproth, Beit. b. v. s. 206. 



Geognottic and Geographic Situations In sand of 

 the river Iser. 



THIRD SUBSPECIES. 

 MENACHANITE, Jameton. Menacan, Werner. Menicln. 



External Character*. Colour greyish black, inclin- nite. 

 ing to iron black. Occurs only in very small flattish 

 angular grains, which have a rough glimmering sur- 

 face. Internally it is glistening or glimmering, or the lus- 

 tre is adamantine, passing into semi-metallic. Opaque. 



Ge^gnoilic and Geographic Situations. It is found, 

 accompanied with fine quartz-sand, in the bed of a ri- 

 vulet which enters the valley of Manaccan in Cornwall. 



III. PYRAMIDAL TITANIUM-ORE, or OCTAHEDRITE, Pyramidal 

 Jameton. Pyramidales Titan-erz, Moht. Octaedrit, Titanium 

 \\rrner. "' 



Pyramid = 97 38'; 137 10'. The least perfect 

 cleavage in the direction of the faces of the pyramid; 

 and the most perfect is parallel to the common base of 

 the pyramids. Streak white. Hardness = 5.5 6.0. 

 Sp. gr. = 3.83.9. 



External Characters Colours blue and brown. Oc- 

 curs crystallized in double four-sided pyramids. In- 

 ternally splendent, and lustre adamantine, inclining to 

 semi-metallic. Is strongly translucent or transparent. 



Geognottic and Geographic Situations. \t is found at 

 Bourg d'Oisans in Dauphiny, in primitive rocks, and 

 in transition clay-slate in Norway. 



GENUS II. RED COPPER-ORE. RID Cor- 



Tessular. Hardness = 3.5, 4. Sp. gr. = 5.6, 6.0. rsa Oaa 



This genus contains but one species, viz. Octahedral 

 Red Copper -Ore. 



I. OCTAHEDRAL RED COPPER-ORE, Jameton. Octahedral 

 Octaedrisches Kupfer-erz, Muht. Red Cop- 



Tessular. Cleavage octahedral. Streak red. P OK. 



This species is divided into four subspecies, viz. Fo- 

 liated Red Copper-ore, Compact Red Copper-ore, Ca 

 pillary Red CopjHrr-ore, and Tile-ore. 

 FIRST SUBSPECIES. 



For IATED RED COPPER-ORE, Jameson. Blattrichcs Foliated 

 Rothlcupferera. Werner. Ked C P- 



External Character*. Colour red. Occurs massive, P" Or '' 

 disseminated, in membranes, corroded ; also in gruuu. 

 4 A 



