Contt. Parit. Arsenic, 

 Cobalt, 

 Iron, 

 Copper, 

 Sulphur, 



Geognostic and Geographic Situaliont. 

 veins and beds in primitive, transition, and secondary 

 rocks, and is found in Cornwall, Germany, France, 

 Poland, Norway, and Sweden. 



GIMUI IV. IRON PYRITES. 

 Tessular, rhomboidal, prismatic. Yellow. Hard- 

 ness = 3.5 6.5. Sp. gr. = 4.4 5. 



1. HEXAHEDRAL IRON-PYBITES, or COMMON Inow- 

 PYRITES, Jameson. Hexahaedrischer Eisen-Kies, Moht. 

 Gemeiner Schwcfelkies, Werner. 



Tessular. Cleavage hexahedral. Bronze yellow. 

 Hardness = 6 6-5. Sp. gr. = 4.7 5. 



External Character* Colour bronze-yellow. Oc- 

 curs most commonly massive, disseminated, and j^lobu- 

 lar ; also in distinct concretions, and crystallized, in 

 cubes, octahedrons, and in the leucite-form. Internally 

 shining and glistening, and lustre metallic. Fracture 

 uneven, and sometimes conchoidal. 



Geognotlic and Geographic Situaliont. It occurs in 

 primitive, transition, and secondary mountains, in every 

 country. 



Uiei. It is never worked as an ore of iron; it is 

 principally valued on account of the sulphur which 

 can be obtained from it by sublimation, and the iron- 

 vitriol which it affords by exposure to the air, either 

 with or without previous roasting. 



2. PBISMATIC IUO.V-I'YFIITE-, or RADIATED PYRITES, 

 Jameton. Prismatischer Eisenkies, 3/oA. 



Prism = 106 36'. Cleavage the same. Bronze 

 yellow. Hardness = 6, 6.5. Sp. gr. = 4.7 5. 



External Character!. Colour bronze-yellow. Occurs 

 massive, in various particulars, external shapes, in ra- 

 diated fibrous and lamellar concretion*, and crystallized 

 in oblique four-aided prisms, variously modified by 

 bevelling and truncating planes. Lustre varies, from 

 shining to glimmering, and is metallic. Fracture un- 

 even, or conchoidal. 



nttU. Parlt. Sulphur, . 53.60 



Iron, . 46.40100 



Halcfiett, Phil. Trans, for 1804. 



Ge^mttic and Geographic Situations. It occurs in 

 primitive, transition, secondary, and alluvial forma- 

 tions ; and the different principal varieties are met with 

 in England, Germany, Spain, and other countries. 



S. RHOMBOIDAL IBON-PYRITES, or MAGNETIC PY- 

 RITES, Jameton. Magnetkies, Werner. 



Di-rhomboidal. Rhomboid unknown. Cleavage in 

 the direction of the terminal planes of a regular six- 

 sided prism; another less distinct parallel with the 

 lateral planes of a six-sided prism. Colour bronze- 

 yellow, inclining to copper-red. Hardness = 3.5 

 4.5. Sp. gr. - 4.4 _4.7. 



External Charactert. Colour intermediate between 

 bronze-yellow and copper-red. Occurs massive, dis- 

 eminated, in coarse granular concretions ; and very 

 rarely crystallized in six-sided prisms and six-sided 

 pyramids. Internally splendent, to glistening, and lus. 

 tre metallic. Fracture conchoidal, or uneven. 



Geognojtic anil Geographic Situations. It occurs in 

 beds, and imbedded in primitive and transition moun- 

 tains, along with common iron-pyrites, magnetic*! 

 iron-ore, and blende, in Scotland, Wales, Germany, &c. 



TOL. XIV. PAT II. 



MINERALOGY. 561 



From KiegeMorf. GENUS V, COPPER-PYRITES. 



74.2174 Many axes. Cleavage tessular. Brass yellow. Steel 



20.3135 grey. Iron black. Hardness = 3.0. 1.0. Sp. gr.= 



S.4257 4.14.9- 



0.1586 This genus contains two subspecies, viz. Octahedral 



0.8860 100 Copper- Pyrites, and Tetraheclral Copper- Pyrites. 

 Strohmeyer. 1. OCTAHEDRAL COPPER-PYRITES, or YELLOW Cop- 

 It occurs in PER PYRITES, Jameson. Octaedrischer Kupferkies, 

 Moiit. Kupferkies, Werner. 



Tessular. Cleavage probably octahedral. Brass 

 yellow. Hardness = 3.O. 4.0. Sp. gr. = 4.1. 4.3. 

 External Characters. Colour brass-yellow. Occurs 

 massive, disseminated, in various particular external 

 forms, and crystallized in octahedrons and tetrahedrons. 

 Internally shining, which in some varieties passes into 

 glimmering. Lustre metallic. Fracture commonly 

 uneven, sometimes even and conchoidal. 



Cornwall. 



Constit. Parlt. Copper, . SO 

 Iron, . 53 



Sulphur, . 12 95 Chenevix. 

 Geognottic and Geographic Situations. Is one of the 

 most abundant metalliferous minerals ; occurs in almost 

 every kind of epository, in all the great classes of 

 rocks, and has a very extensive geographical range. 



L'tet. Nearly one-third of the copper which is 

 obtained by metallurgic operations, is extracted from 

 this species. 



2. TETRAHEDRAL COPPER-PYRITES, Jameton. Te- 

 traedrischer, Kupferkies, Molts. 



Tessular. Cleavage probably octahedral. Steel-grey 

 and iron-black. Harilness=:S.O. 4.0. Sp.gr. = 4.4. 4.9. 

 This species is subdivided into two subspecies, viz. 

 Grey Copper and Black Copper. 



FIHST SUBSPECIES. 



GREY-COPPER, Jameton. Fahlerz, Werner. Cuivre 

 gris arsenifcre, Haiiy. 



External Charactert. Colour steel-grey. Occurs 

 massive, disseminated, and crystallized in tetrahedrons 

 variously modified. Internally glistening and metallic 

 lustre. Fracture uneven, sometimes conchoidal. 



Freyberg. 



Conttiluent Paris. Copper, . 42.50 

 Iron, . 27.60 



Sulphur, . 10.00 

 Arsenic, . 15.60 

 Silver, . 0.90 



Antimony, . 1 .50 98.00 



Klaproth, Beit. b. iv. s. 52. 



Geognottic and Geograjthic Situations. It occurs in 

 beds and veins, in primitive, transition, and secondary 

 rocks, in different parts of Scotland and England, and 

 also in many mining districts in other countries. 



L'tes. It is valued as an ore of copper ; and when 

 it contains silver, is worked as an ore of that metal. 



SECOND SUBSPECIES. 



BLACK COPPER, Jameton. Schwarzerz, Werner. 

 Cuivre gris antimonifere, Hau./. 



External Characteri. Colour iron-black, which 

 sometimes inclines to steel-grey. Occurs massive, 

 disseminated, and crystallized in tetrahedrons variously 

 modified. Internally shining and splendent. Lustre me- 

 tallic. Fracture conchoidal. Kapnik in TraiuylvanU. 



Oryctogao- 

 sy. 



CorpEK 

 PYRITES. 



Octahedral 

 copper py- 

 ritea. 



Tetrahc- 

 dral cop- 

 per py- 

 rites. 



Grey cop- 

 per. 



Black ccp- 

 per. 



Cointit. Parlt. 



Copper, 



Antimony, 



Sulphur, 



Silver, 



Iron, 



Zinc, 



Loss, 



82.00 



28.00 



0.25 



3.25 



500 



3.75 100.00 



Klaproth, Beit. b. iv. s. 56, 68, 73, and 80. 



