MAGNETKIES. 

 lamellar. Colour iron-black. Lustre metal- 

 lic, or submetallic. Opaque. Streak black. 

 Brittle. Fracture uneven or conchoidal, 

 with a splendent lustre. Strongly magnetic, 

 especially when massive, and sometimes ex- 

 hibits polarity. H. 6-5 to 6-o. S.G. 4-9 to 5-2. 



Comp. Fe *#e== protoxide of iron 30-97, 

 peroxide of iron 96'U3, or iron 71-68, oxygen 

 28-32 = 100, 



BB turns brown and loses its influence 

 on the magnet, but fuses with difficulty. 



Soluble in heated muriatic acid, but not 

 in nitric acid. 



Localities.— English. Cornwall: Trelus- 

 ■vvell, near Penryn ; Koche and occasionally 

 at St. Agnes, Huel Harmony and Fowey 

 Consols. Haytor in Devonshire, with j 

 Felspar and Hornblende. — Scotch. Portsoy j 

 in Banffshire. Unst and other places in j 

 the Shetlands. East Kona, one of the He- 

 brides, in gv?imte,fig. 272. Near Loch Long, 

 Sec— Irish. Ballvjcoog, co. WickIo^y. In 

 amygdaloid at Muck and Magee Islands, 

 CO. Antrim, figs. 271, 273, containing 2-00 

 per cent, of magnesia and 23 oxide of 

 manganese. (Dr. Andrews). — Foreign. The 

 ore of Arendal in Norway, and of nearly all 

 the celebrated iron mines of Sweden, con- 

 sists of massive Magnetite, Dannemora, 

 and the hill of Taberg in Smaoland, are 

 almost entirely composed of it; and it is 

 stated b}^ Jameson that the loose masses 

 found at "the base of the latter hill have fur- 

 nished materials for extensive iron-works 

 for upwards of 150 years, Kuruuavara 

 and Gellivara in Lapland, Normark in 

 Wermland in splendid dodecahedral crystals, 

 Neudeck in Bohemia. Hungary, The 

 TyroL Saxony, Silesia, The Harz, 

 Traversella in Piedmont, St. Gotthardt, 

 Switzerland, Puy in France. Vesuvius, 

 in ejected masses. Elba, Corsica, The 

 East Indies. Puchamanche in Chili. United 

 States. The Canadas, &c. New Zealand, 

 in the form of sand, derived from the de- 

 composition of trachytic rocks. 



The jnost powerful natural magnets are 

 found in compact or earthy amorphous 

 masses in Siberia, Sweden, Elba, and the 

 Harz. See Lodestone. 



Brit, Mu3., Case 14, 



31. P. G. Principal floor. Wall-cases 47 

 (British); 18 (Foreign); 39 (E. Indies), 



Magnetkies, Werner. See Pykrhotine. 



MagnoferFvIte, The name given by 

 Eanimelsberg to the octahedral iron which 

 occurs interlamiuated with Hematite, in the 

 fumaroles formed at Vesuvius after the 

 eruption of 1855. S.G. 456 to 4-838. 



MALACHITE. 





Camp. Mg5Ee4, 





Analysis, by Rammelsherg : 





Peroxide of iron . 



Magnesia 



Oxide of copper . 



Insoluble 



, 82-91 

 , 13-60 

 . 0-99 

 . 2-51 



225 



lOO'Ol 

 Malachite, Jameson, Brochant, Kirwan, 

 Beudant. Oblique. Primary form a right 

 rhombic prism, in twins. Jig. 274. Rarely 

 occurs crystallized, but generally massive, 

 with a globular, reniform, botryoidal or 

 stalactitic surface ; frequently fibrous and 

 banded in colour ; often granular or earthy. 

 Colour various shades of bright green, ex- 

 hibiting all degrees of translucency down to 

 complete opacity. Lustre of crystals ada- 

 mantine, inclining to vitreous; of fibrous 

 varieties, silky. Streak paler than the co- 

 lour. Brittle, Fracture imperfect-conchoi- 

 dal to uneven. H, 3-5 to 4. S.G. 3-7 to 4. 



.^Xl-^ 



Fig. 274. 



Comp. Carbonate of copper, Cu^ (J = prot- 

 oxide of copper 71-9, carbonic acid 19-9, 

 water 8-2 = 100. 



Analysis, by Phillips : 

 Carbonic acid 

 Protoxide of copper 

 Water . 



18-5 

 79-? 



100-0 

 BB alone infusible ; decrepitates and turns 

 black. With borax readily alfords a glo- 

 bule of copper, and colours the flux green. 



Soluble with effervescence in acids, and 

 forms a blue solution with ammonia. 



Localities. — English. Common in Corn- 

 wall, associated with Bed Oxide of Cop- 

 per. Cumberland ; botryoidal at Huel Ed- 

 ward ; crystallized (j?^. 274), acicular, and 

 fibrous, at Red GUI, Haygill, and Roughten 

 Gill, near Hesket Newmarket, and at Mex- 

 ico Mine. — Scotch. The old copper mine, 

 Sandlodge, in Mainland, one of the Shet- 

 lands, in fine acicular crystals, &c. — Irish. 

 Audley Mines, and Coosheen, near Skull, 

 CO. Cork. Limerick, &c. — Foreign. Compact 

 at Schwatz in the Tyrol. Fibrous abund- 

 antly in Siberia. Chessy in France. Crys- 

 tallized near Siegen in Prussia. Spain. 

 Q 



