554 



MINERALOGY. 



Compact 

 Red Cap- 

 per Ore. 



Capillary 

 Red Cop. 

 per Ore. 



Oryctogno- Ur concretions, and crystallized in variously modified 



..** . octahedrons. Internally alternates from shining to glis- 



'~~v~ m tening ; lustre adamantine, inclining to semi-metallic. 



Fracture coarse and small-grained uneven. Ranges 



from opaque to translucent. 



SECOND SUBSPECIES. 



COMPACT REDCoppER-OREjJanieson. DichtesRoth- 

 kupfererz, Werner. 



External Characters. Colour red. Occurs massive, 

 disseminated, and in a kind of reniform shape. Inter- 

 nally glimmering, inclining to glistening ; lustre semi- 

 metallic. Fracture even, inclining to flat conchoidal. 

 Opaque. 



THIRD SUBSPECIES. 



CAPILLARY RED COPPER-ORE, Jameson Haarfor- 

 miges Roth Kupfererz, Werner. 



External Characters. Colour red. Occurs in small 

 capillary crystals, also in thin tables, which are some- 

 times aggregated into amorphous and scopiform flakes. 

 Shining. Lustre admantine. Translucent. 



Cornwall. 



Constituent Parts. Copper, . 88.5 



Oxygen, . 11.5 100.0 



Chenevix, Phil. Trans. 



Geographic and Geognostic Situation. It occurs in 

 veins in primitive transition and secondary rocks, as 

 Cornwall, and in several mines on the continents of 

 Europe, Asia, and America. 



FOURTH SUBSPECIES. 



TILE-ORE, Jameson. Ziegelerz, Werner. 



This subspecies is divided into two kinds, viz. Earthy 

 Tile-ore, and Indurated Tile-ore. 



First Kind. EARTHY TILE-ORE, Jameson Er- 

 diches Ziegelerz, Werner. 



External Characters. Colours red and brown. Oc- 

 curs massive, disseminated, and incrusting copper- 

 pyrites. Composed of dull dusty particles, which are 

 more or less cohering. Soils slightly. Feels meagre. 



Geognostic and Geographic Situations. Occurs in 

 veins in the Hartz, Tyrol, &c. 



Second Kind. INDURATED TILE-ORE, Jameson. 

 Festes Ziegelerz, Werner. 



Tile Ore. 



tallized, and in the form of rectangular prisms, various- Oryctogo- 

 ly modified by truncations and acaminations. Inter- ! 

 nally alternates from splendent to glistening. Lustre ' J 

 intermediate between resinous and adamantine. Frac- 

 ture uneven, inclining to conchoidal. Alternates from 

 semi-transparent to opaque. Yields a greyish-white 

 streak. From Altcrnon. 



Constituent Parts. Tin, . 77.50 

 Iron, . 0.25 

 Oxygen, . 21.50 



Silica, . 0.75 100 



Klaproth, Beit. b. ii. s. 256. 



Geognostic and Geographic Situations. Occurs dis- 

 seminated, in granite,' gneiss, mica-slate, clay-slate, 

 porphyry, and in an alluvial form, in what are in Corn- 

 wall named Stream Works. Cornwall contains the 

 greatest European tin mines, and Banca in India the 

 most extensive beyond Europe. 



SECOND SUBSPECIES. 



CORNISH TIN-ORE, or Wooo-TiN, Jameson. Kor- Cornish 

 nisch Zinnerz, Werner. tin ore. 



External Characters. Colour hair-brown, wood- 

 brown, and reddish-brown. Occurs reniform, bo- 

 tryoidal, and globular ; and in fibrous distinct concre- 

 tions. Internally feebly glistening or glimmering, and 

 lustre resinous. Opaque. Streak grey, inclining to 

 brown. 



Geognostic and Geographic Sluations It occurs 

 loose, and in small quantities, along with stream tin, in 

 alluvial deposites (stream-works,) in Cornwall. 



GENUS IV. WOLFRAM ORE. WOLFIUM 



Scheel-erz, Mohs. OBE. 



Prismatic. Hardness =5.0 5.5. Sp.gr.=7.1 _7.4. 



This genus contains one species, viz. Prismatic Wql- 

 fram. 



1. PRISMATIC WOLFRAM, Jameson Prismatisches Prismatic 

 Scheel-erz, Mohs. Wolfram, Werner. wolfram. 



Prism = 120. Cleavages in the direction of the 

 diagonals of the oblique four-sided prism. Streak 

 dark reddish brown. 



External Characters. Colour black, and rarely a 

 temper-steel tarnish. Occurs massive, and crystalliz- 





External Characters. Colours red, brown, grey, and e( j j n oblique four-sided prisms, variously modified by 



TIX-OBE. 



1'yramidal- 

 tin-orc. 



black. Occurs massive, disseminated ; also in curved 

 lamellar and fibrous concretions. Internally glimmer- 

 ing or glistening, and resinous. Fracture conchoidal. 



Constituent Parts.* Werner considers it to be an in- 

 timate combination of red copper-ore and brown iron- 

 ochre. It contains from 10 to 50 per cent, of copper. 



Geognostic and Geographic Situations. Occurs in 

 veins in Cornwaf' arsd other countries. 

 GENUS III. TIN-ORE. 

 Zinnerz, Mohs. 



Pyramidal. Streak not black. Hardness = 6.0 

 7.0. Sp. gr. = 6.3. 70. 



This genus contains one species, viz. Pyramidal Tin- 

 Ore. 



1. PYRAMIDAL TIN-ORE, Jameson. Pyramidales 

 Zinnerz, Moks. 



Pyramidal. Pyramid = 133, 36', 67, 42'. The 

 most perfect cleavage is in the direction of the lateral 

 planes of a rectangular four-sided prism, and another 



less perfect, in the direction of the diagonals of the tal-erz, Mohs. 



truncation, bevelment, and acumination. Cleavage 

 shining or splendent ; fracture glistening ; lustre resi- 

 nous, inclining to adamantine. Fracture coarse and 

 small grained uneven. Opaque. 

 Constituent Parts. Tungstic Acid 67-00 



Oxide of Manganese, 6.25 

 Oxide of Iron, . 18.10 

 Silica, . . 1.5092.75 

 Fauquelin, in Journ. d. Min. N. 19. 18. 

 Geognostic and Geographic Situations. Occurs in 

 primitive rocks, in the island of Rona, one of the He- 

 brides, also in Cornwall and other counties. 



GENUS V. TANTALUM-ORE. TAKTA- 



Tantal-Erz, Mohs. M OBE - 



Prismatic. Streak brownish black. Hardness = 

 6. Sp. gr. = 6, 6.3. 



This genus contains one species, viz. Prismatic Tan- 

 talum-ore. 



1. PRISMATIC TANTALUM-ORE. Prismatisches Tan- Prismatic 



Common 

 tin-ore. 



same prism. Streak white and brown. 



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

 mon Tin-Ore or Tinstone, and Cornish Tin-Ore. 

 FIBST SUBSPECIES. 



COMMON TIN-ORE or TINTSTONE, Jameson. Zin- 

 stein, Werner. 



External Characters. Colours brown, black, green, 

 white, yellowi and red. Occurs most frequently crys- 



Prismatic. Prism unknown. 



External Characters. Colours greyish and brownish 



black. Occurs massive, disseminated, and crystallized 

 in oblique four-sided prisms, the dimensions of which 

 are unknown. Externally and internally shining or 

 glistening, and lustre resinous, inclining to semi-me- 

 tallic adamantine. Fracture uneven, or conchoidal. 

 Opaque. 



tantalum 

 ore. 



