< Iryctogno* 

 sy. 



Axifrangi- 

 J.le Anti- 

 mony 

 Glance. 



Prismatic 

 Antimony 

 Glance. 



OKDEttXII 



BLENDE. 



564 



2. AXIFHANGIBLE ANTIMONY GLANCE, or BOURNO- 

 NITE. Axentheilender Spiesglas Glanz, Mohs. 



Prism unknown. Axifrangible. Colour Blackish, 

 lead-grey, passing into steel-grey. Hardness = 2.0, 

 2.5. Sp. gr. = 5.5 5.8. 



External Characters Colour blackish lead-grey, 

 passing into steel-grey. Occurs massive, disseminated 

 and crystallized in oblique four-sided prisms. Exter- 

 nally shining and metallic; internally glistening and 

 metallic. Fracture conchoidal or uneven. 



Constituent Parts Lead, 42.62 ; Antimony, 24.23. 

 Copper, 18.20; Iron, 1.20; Sulphur, 17.00=100. 

 Hatchett, Phil. Trans. 1804. p. 63. 



Geognostic and Geographic Situations. Found in 

 Cornwall in veins in clay-slate; also in Germany, Si- 

 beria and Peru. 



3. PRISMATIC ANTIMONY GLANCE; " Prismatischer 

 Spiesglas-glanz, Mohs, 



Prism unknown. 

 er diagonal. Blac 

 Sp. gr. = .5.7.-^ 



External Chi 

 Crystallized n obliqj 

 ing and metallic. 



OHDER XIT. 

 If metallic, the colour is black*Vith a green streak'. 

 If not metallic, the lustre is adamantine." J 

 streak is brown or white, it' is tessu 

 ness between 4.0. and 4.2. 

 specific g 

 and le " 

 If ' 



MINERALOGY. 



' of the short- 

 ess 2.5. 3.0. 



lead-grey, 

 e shin- 



MANGA- 

 NESE. 

 BLENDE. 



ness =!>" 4.0. 

 Prismatic j. p' RISM ATIC MANCV 

 Manganese mat jgj. her Glanz-Blenj 

 Blende. -+t*. TI 



Prismatic. Pyra,^ 



but veuy imperfect. 

 T-CharMcte 



llard- 

 3.9. I.U. 

 ILKXUE, Jai:ii.su,!. Pris- 



known. Cleavage prismatic, 

 -tall i i 



'lour on the f'resl 



jjrofhblack, but on e'xjjMIM- become-; HBOied 

 brojjjnish-black colour. TJcc^B 

 in*granular concretions, ancT 

 four-sided prisms. Lustre splenOTffP 

 semi-metallic. Opaque. Streak of a greenisn colour. 

 Constituent Parts. Oxide of Manganese, 85 



100 



i. s. 405. 

 uncl in 



Zisc 



BLEXDE. 



Dodecahe- 

 dral Zinc 

 Blende. 



Vaiti 



Geognostic and Geng 

 Cornwall, and at Nag'y 

 ores of tellurium, blen 

 manganese, and brown-spar.'- 



GENUS. II. ZINC-BLENDE OH GARNET- 

 BLENDE. 



Granat-Blende, Mohs. 



Many axes. Tessular. Streak brown and white. 

 Hardness = 3.5. 4.0. Sp. gr. = 4.O. 4.2. 



1. DODECAHEDRAL ZINC-BLENDE. Dodecaeclrischer 

 Granat-Blende, Mohs. Blende, Werner. 



Tessular. Cleavage dodecahedral. Streak white 

 or reddish-brown. 



External Characters. Colours yellow, brown, and 

 black. Occurs massive, disseminated, in granular con- 

 cretions, and crystallized in rhomboidal dodecahedrons, 

 octahedrons, and tetrahedrons. Lustre splendent and 

 adamantine, inclining more or less to metallic. Alter- 

 nates from opaque to transparent. 



Oryctogno- 



BLENDE. 



Northumberland. 



Const. Parts. Zinc, . 58.8 

 Sulphur, 23.5 

 Iron, . 8.4 



Silica, . 7-0 97.7 Thomson. 



Geognostic and Geographic Situations. It occurs in 

 veins in primitive, transition, and flcetz rocks, where it 

 is generally associated with galena or lead-glance. Oc- 

 curs in all the lead mines in Scotland and England, 

 and also in those on the Continent. 



Uses. It is principally valuable as an ore of Zinc. 



GENUS III. ANTIMONY-BLENDE, or RED 

 BLENDE. 



Nadel-Blende, Mohs. 



Three axes. Prismatic. Streak red. Hardness = 

 1.0. 1.5. Sp. gr. = A.5. 4 6. 



1. PRISMATIC ANTIMONY-BLENDE, or RED ANTIMONY, Prismatic 

 Jameson. Prismatische Nadel-Blende, Mohs. Roth- Antimony 

 spiesglas-erz, Werner. 



Prismatic. Pyramid unknown. Cleavage prisma- 

 toidal. Streak red. 



External Characters. Colour cherry-red. Occurs 

 massive, disseminated, in flakes ; in scopiform and stel- 

 . lular, fibrous, and granular distinct concretions ; and 

 crystallized in oblique four-sided prisms. Externally 

 and internally shining. Lustre nearly adamantine, 

 translucent on the edges. Colour not 



til-uent Paris. From 

 nung Gut 



ygen, 

 ^Sulphur, 

 MM 



Klaprolh, 

 iul Gcogi\i r 

 in veins, in primiti 



\eueHoff- 



19.70 98.00 



182. 



Wis rare 

 ixony, 



mineral occur 

 France, and I 



"RUBY-BLENDE. 



iubin-Blende, Mohs. 

 Rhomboidal. Hardness = 2.0. 2.5. 

 .). gr. = 5.2. 8.2. 

 Two . species, viz. RHOMBOIDAL and PHISMATO- 

 RHOMBOIDAL * RED ZINC. 



1. RHOMBOIDAL RUBY-BLENDE, or RED SILVER, 

 Jamejow.-i-Rhomboedrische Rubin-Blende, Mohs. 



RK6Ynb6idal. Rhomboid = 109' 28'. Cleavage rhom- 

 boidal. Streak red. Hardness = 2. 5. Sp.gr. =5.2. 5.8. 

 External Characters. Colour intermediate between 

 cochineal-red and dark lead-grey, and sometimes in 

 clines to carmine red. Occurs massive, disseminated, 

 in membranes ; and crystallized in six-sided prisms, 

 and six-sided pyramids. Externally alternates from 

 shining to splendent ; lustre semi-metallic or adaman- 

 tine. Internally alternates from shining to glimmering; 

 lustre sometimes adamantine, sometimes semi-metallic. 

 Fracture uneven or conchoidal. Opaque, or more or 

 less translucent. Streak cochineal red. 

 Constituent Parts. Silver, . 60.0 

 Antimony, . 20.S 

 Sulphur, . 14.7 



Oxygen, . 5.0 100.0 



Klaproth, Beit. b. v. s. 200. 



Geognostic and Geographic Situations. It occurs in 

 veins in gneiss, mica-slate, porphyry, and grey-wacke, 

 in various mining districts, as Cornwall, Hartz, Hun- 

 gary, Mexico, and Peru. 



2. PRISMATO-RHOMBOIDAL RUBY-BLENDE or CIN- 

 NABAR, Jamfjort. Prismato- Rhomboedrische Rubin- 

 Blende, Mohs. 



Ku BY- 

 BLENDE. 



Rhomboi- 

 dal ruby, 

 blende. 



Prismato- 

 rhomboi- 

 dal ruby-, 

 blende. 



