558 



MINERALOGY. 



Oryctogno- 



MANGA- 

 XEE QBE 



Prismatic 

 Manga- 

 nese ore. 



Grey Man- 



Constituent Parts. 



Oxide of Iron, . . 61.0 



Oxide of Manganese, . . 7.0 



Phosphoric Acid, with a trace of Sulphur, 2.5 

 Water, . . .19.0 



Silica, . . 6.0 



Alumina, . , . 2.0 97.5 



Daubuisson, Annal. de Chim. 1800. 

 Geognostic and Geographic Situations of Bog-iron ore. 

 It is found in various places in the Highlands of 

 Scotland, in the Hebrides, and Orkney and Shetland 

 Islands, in alluvial soil. Also abundantly on the con- 

 tinents of Europe and America. 



Uses Affords good iron on smelting. 



GENUS X. MANGANESE-ORE. 

 Mangan-erz, Mohs. 



Prismatic. Hardness = 2.5 6. Sp. gr. = 4.3 4.8. 



This genus contains but one species, viz. Prismatic 

 Manganese ore. 



1. PRISMATIC MANGANESE-ORE, Jameson. Prisma- 

 tisches Mangan-erz, Mohs. 



Prism nearly 100. Most perfect cleavage in direc- 

 tion of the longer diagonal. 



This species contains three subspecies, viz. Grey 

 Manganese.ore, Black Manganese-ore, and Scaly 

 Brown Manganese-ore. 



FIBST SUBSPECIES. 



GREY MANOANESE-ORE, Jameson. Grau Braun- 

 ganese ore. steinerz, Werner. 



External Characters. Colour dark steel-grey, in- 

 clining more or less to iron-black. Occurs massive, in 

 various particular external shapes, in fibrous and radiat- 

 ed concretions, and crystallized in four-sided prisms. 

 Lustre shining, glimmering, and metallic; fracture 

 conchoidal and earthy. Streak black. 



Const. Parts. Black Oxide of Manganese, 90.50 

 Oxygen, . . 2.25 



Water, . . 7.00 



Klaprolh, 100. 



Geognostic and Geographic Situation. Occurs in 

 veins and imbedded masses in primitive rocks in Scot- 

 land, England, France, and Germany. 



Uses. It is added to glass, in small quantity, when 

 we wish to destroy the brown colour which that mate- 

 rial receives from intermixed inflammable substances, 

 or in larger quantity when we wish to give to it a vio- 

 let blue colour. It affords a fine brown colour, which 

 is used for painting on porcelain. It is employed in 

 the laboratory, as the cheapest and most convenient 

 material from which to procure oxygen gas. All the 

 oxymuriatic acid used in bleacheries, and for the pur- 

 pose of destroying contagious matter, is prepared from 

 manganese, and the usual materials of muriatic acid. 



SECOND SUBSPECIES. 

 BLACK MANGANESE-ORE, Jameson. 

 External Characters. Colours bluish-black and 

 steel-grey. Occurs massive, tuberose, fruticose, reni- 

 form, and botryoidal ; also in fibrous and lamellar con- 

 cretions. Internally glimmering, glistening, and me- 

 tallic. Fracture conchoidal. Opaque. Streak blackish- 

 brown. 



Geognostic and Geographic Situations. Occurs in 

 veins in primitive transition and secondary rocks in 

 Saxony, Hanover, &c. 



THIRD SUBSPECIES. 



*caly- SCALY BROWN MANGANESE-ORE, Jameson. Braun- 



Brown er Eisenrahm, Werner. 



Manganese External Characters. Colour intermediate between 

 steel-grey and clove-brown. Occurs in crusts, mas- 

 sive, spumous, fruticose, and irregular dendritic. Fri- 



Black 



Manganese 



ore. 



ABSEKIC. 



able, or friable passing into solid. Composed of scaly Oryctogno. 

 particles, which are intermediate between shining and *y- 

 glistening, with metallic lustre. Soils strongly. Feels S "V >1> ' 

 greasy. 



Geognostic Situation. Occurs in drusy cavities in 

 brown hematite, 



Geographic Situation It is found near Sandlodge in 

 Mainland, one of the Shetland Islands ; and in various 

 iron mines on the Continent of Europe. 



ORDER IX. NATIVE METALS. O D ix. 



Metallic. Not black. If grey, is ductile ; and sp. NATIVE 

 gr. s= 7.4. and more. Hardness = 0. _ 4, or mallea. ' 

 ble. Sp. gr.= 5.7 2.0. 



GENUS I. ARSENIC. 



Form unknown. Tin white. Hardness = 3.6. Sp. 

 gr. = 5.7 5.8. 



1. NATIVE ARSENIC, Jameson. Gediegen Arsenik, Native Ar- 

 Wtrner and Mohs. senic. 



Reniform and massive. 



External Characters. Colour tin white. Internally, 

 on the fresh fracture, usually glistening, inclining to 

 glimmering, sometimes to shining, and the lustre me- 

 tallic. Fracture small, and fine-grained uneven. 



Chemical Characters. Before the blowpipe it yields 

 a white smoke, diffuses an arsenical odour, burns with 

 a blue flame, is gradually and almost entirely volatil- 

 ised, and deposits a white coating on the coal. 



Const. Parts. It usually contains a small portion of 

 iron, and when it occurs with gold or silver, a little 

 gold or silver. 



Geognostic and Geographic Situations. It occurs in 

 veins in primitive rocks, as in gneiss, mica-slate, and 

 clay-slate, and less frequently in transition and secon- 

 dary rocks, in Norway, Germany, France, Spain, &c. 



GENUS II. TELLURIUM. TILIC- 



Form unknown. Tin white. Hardness = 2 2.5. iu. 

 Sp. gr. = 6.1, 6.2. 



This genus contains one Species, viz. Native Tel- 

 lurium. 



1. NATIVE TELLURIUM, Jameson. Hexahaedrisches Native 

 Tellur, Mohs. Gediegen Sylvan, Werner. Tellurium. 



Massive. 



External Characters. Colour tin-white. Occurs 

 massive. Internally shining, and lustre metallic. 



Constit. Parts. Tellurium, . 92.55 

 Iron, . 7.20 



Gold, . 0.25 100.00 



Klaproth, Beit. b. iii. s. 8. 



Geognostic and Geographic Situations. It occurs in 

 veins in grey-wacke, in Transylvania. 



GENUS III. ANTIMONY. ANTIMO- 



Tessular, prismatic. Not ductile. White. Hard- N Y. 



ness = 3 3.5. Sp. gr. = 6.510. 



This Genus contains two Species, viz. Dodecahedral 



Antimony, and Octahedral Antimony. 



1. DODECAHEDRAL ANTIMONY, Jameson. Dodecae- Dodeca- 

 drisches Spiesglas, Mohs. Gediegen Spiesglas, Werner, hedrai An- 



Tessular. Cleavage octahedral and dodecahedral. timony. 

 Hardness = 3_3.5. Sp. gr. = 6.56.8. 



External Characters. Colour perfect tin-white. 

 Occurs massive, disseminated, reniform; also in granu- 

 lar and lamellar distinct concretions. Crystallized, in 

 octahedrons and rhomboidal dodecahedrons. Splendent 

 and metallic. 



Geognostic and Geographic Situations. It is found 

 in argentiferous veins in the gneiss mountain 'of Cha- 

 lanches in Dauphiny. 



2. OCTAHEDRAL ANTIMONY, Jameson. Octaedris- Octahedral 

 ches Spiesglas, Mohs. Antimony. 



Tessular. Cleavage octahedral. Hardness 3.5. 

 Sp. gr. = 8.9, 10. 





