228 MAN^GANKTESEL. 



versing porphyry. Thuringia. Bohemia. 

 Saxony. Unclenaes in Sweden. Christian- 

 sand in Norway. 



Manganite is the purest and most beauti- 

 fully crystallized ore of manganese. It is 

 distinguished from Pyrolusite by its greater 

 hardness and brown streak, which some- 

 times appears black until a portion has been 

 abraded. 



Brit. Mus., Case 13. 



Mangankiesel. See Khodonite. 



Mangankupfekerz, Credner. See Cred- 



NERITE. 



Mangankupferoxyd, Hausmann. See 

 Credneritk. 



Makganocalcite, Breithaupt. A mineral 

 bearing the same relation to Diallogite 

 which Aragonite does to Calc Spar. Occurs 

 in rhombic prisms, like Aragonite, with a 

 lateral cleavage. Colour flesh-red to reddish- 

 white. Lustre vitreous. Translucent. H. 

 4 to 5. S.G. 3-037. 



Comp, Like Diallogite or (Mn, Fe, Ca, 

 Mg) C. 

 Analysis, by Rammelsherg : 

 Carbonate of manganese. 



Carbonate of iron 

 Carbonate of lime 

 Carbonate of magnesia 



67-48 

 3-22 



18-81 

 9-97 



99-48 



Locality. Schemnitz in Hungary. 



Manganschaubi, Hausmann. See Wad. 



Manganspath, Werner. See Diallo- 

 gite. 



Man GAN -VITRIOL, docker. See Sul- 

 phate OF Manganese. 



Marasmolite, Shepard. A partially 

 decomposed Marmatite, containing some 

 free sulphur; from Middletown, Connecti- 

 cut, U.S. 



Marcasite, Haidinger. Iron P_\^rites. 

 Rhombic : primary form a right rhombic 

 prism. Occurs crystallized in modified 

 rhombic prisms ; also stalactitic, reniform, 

 and botryoidal. Colour pale bronze-yellow 

 or nearly tin-white, with a tinge of yellow 

 or grey. Lustre metallic. Streak dark 

 greenish-grey. Brittle. Emits a smell of 

 sulphur when triturated. Very liable to 

 decompose. Fracture uneven. H. 6 to 6-5. 

 S.G. 4-65 to 4-88. 



Comp. Bisulphide of iron, or Fe S^^iron 

 46-7, sulphur 63-3 = 100. 



BB behaves like Pyrites. 



Localities. Often in the joints or " backs" 



MARCASITE. 

 of coal. English. — Cornwall; Crowndale, 

 Cook's Kitchen, Huel Unity, Fowey Consols, 



Fig. 278. 



Fig. 2? 



East Huel Rose, stalactitic and radiated. 

 Devonshire: on crystallized Quartz at 

 Virtuous Lady Mine, fiy. 279 ; Tamar Sil- 

 ver-lead Mines, near Tavistock ; Combmar- 

 tin. Kent : in grey chalk marl near Folke- 

 stone and Dover, Jig. 278 ; Isle of Sheppey. 

 Devizes, in Wiltshire. Near Castleton, 

 Derbyshire, figs. Ill and 279. On crystals 

 of Calc Spar at Garrigill in Cumberland, 

 fig. 278. — Scotch. Alva mine, Stirlingshire. 

 — L-ish. Near Dublin : in lance-shaped crys- 

 tals at Kilkee, co. Clare. — Foreign. In 

 the plastic clay of the Brown Coal forma- 

 tion at Littmitz and Alsatell, near Carlsbad 

 in Bohemia (Spear and Radiated Pyrites). 

 Joachimsthal and various parts of Saxony. 



Name. The word Marcasite is stated by 

 Koch to be derived from an Arabic word, 

 maior kjass idd, signifying " like a shining, 

 fire-giving stone." 



Brit. Mus., Case 16. 



M.P. G. Horse-shoe Case, No. 150. 



Under the term Marcasite are included 

 several varieties, which have been named 

 after the forms they present : viz. Cellular 

 Pyrites, Cockscomb Pyrites, Hepatic Pyrites 

 or Leberkies, Lonchidite, Radiated Pyrites, 

 Spear Pyrites, &c. Marcasite is more"^ liable 

 to decomposition than ordinary Pyrites, and 

 is of a much paler colour. It is used in the 

 manufacture of sulphur, sulphuric acid, and 

 sulphate of iron, but not to so great an 

 extent as ordinar'y Pyrites. It is also em- 

 ployed for ornamental purposes. Formerly 

 it was made into shoe- and knee-buckles, 

 and set in pins, bracelets, watch-cases, &c. ; 

 but the demand has very much diminished, 

 of late years, owing probably to the mineral 

 being so common. The taste revived to 

 some extent in 1846, when a great quantity 

 of these stones, having reached Paris, 

 were mounted after the manner of old- 

 fashioned jewelry, and had a great run at 



