224 MACLE. 



rieties of lolite having the same colour, and 

 also called when pale Water Sapphire, or 

 Sapphire d'eau, • 



M. 



Macle, Haily, Bi'ongniart, Cleaveland. 

 See Chiastolite. The name, as that of a 

 distinct species, is applied to the white 

 prisms only. The black rhombs and lines 

 are an argillaceous substance of the same 

 nature as the gangue, with a few whitish 

 particles of Made intermixed. 



M. P. G. Horse-shoe Case, No. 1005. 



Maclureitb, Seybert. A name given to 

 Chondrodite, in honour of Mr. Maclure. 



Macrotypous Kouphone-spar, Mohs. 

 See Levyne. 



Macrotypous Lime- haloid, Mohs. See 

 Dolomite. 



Macrotypous Parachrose - baryte, 

 llohs. See Diallogite. 



Magnes. Pliny's name for the Lode- 

 stone, after that of the country (Magnesia, 

 a province of ancient Lydia,) where it was 

 found. 



Magnesia-alum ; Magnesia - alaun, 

 Rammehherg. Occurs in white fibrous masses, 

 and efflorescences, which become opaque on 

 exposure to the atmosphere. Lustre silky. 



Comp. Mg 8 + Al S3 + 24H = sul pha te of 

 magnesia 13*4, sulphate of alumina 38"3, 

 water 48-3 = 100. 



Analysis, by A. A. Hayes ; 



Sulphuric acid . . . 36-322 

 Alumina .... 12-130 

 Magnesia .... 4-682 

 Lime ..... 0-126 

 Protoxides of iron and man- 

 ganese .... 0-430 

 Muriatic acid . . . 0-604 

 Water .... 45-450 



99-740 



Locality. Near Iquique, in Peru. South 

 Africa. 



Magnesia-glimmer, Naumann. See 

 Biotitb, 



Magnesia-hydrat, See Brucite. 



Magnesia-mica, Nicol. See Biotite. 



Magnesian Carbonate of Lime. See 

 Dolomite. 



Magnesian Pharmacolite. SeeKuiiN- 

 ite: 



Magnesie Boratee, Haiiy. See Bora- 

 cite. 



Magnesie Hy'dratee, Haiiy. See Bru- 

 cite. 



MAGNETITE. 

 Magnesie Hydratee Siliceuse, Levy. 

 See Marmohte. 



Magnesie Nitratee, Dufrenoy. See 



NiTROMAGNESITE, 



Magnesie Phosphatee, Dufrenoy. See 

 Wagnerite. 

 Magnesie Sulfates, HaUy. See Epsom - 



ITE. 



Magnesite, Thomson. See Meerschaum. 



Magnesite, v. Leonhard. Hexagonal. 

 Cleavage rhombohedral, perfect. Also amor- 

 phous, massive, compact, and sometimes in 

 radiating groups. Colour white, greyish- 

 white, or yellowish, Avith blackish-brown 

 markings. Lustre vitreous. Transparent to 

 opaque. Somewhat meagre to the touch. 

 Adheres to the tongue. Fracture flat-con- 

 choidal. H. 3-5 to 4-5. S.G. 2-8 to 3-056. 



Comp. Carbonate of magnesia, Mg = 

 magnesia 47-62, carbonic acid 52-38 = 100. 

 Analysis, by Stromeyer : 



Magnesia . . . . 47 64 

 Carbonic acid . . . 5075 

 Water and impurities . . 1-61 



100-00 



BB infusible. 



Dissolves slowly, with slight effervescence, 

 in nitric or dilute sulphuric acid. 



Localities. Gulsen Mountains in Upper 

 Styria, in Serpentine, with Bronzite. Hrub- 

 schitz in Moravia. Baumgarten in Silesia. 

 Baldissero and Castellamonte in Piedmont. 

 Vallecas, near Madrid. Madras. United 

 States. Canada, forming an immense bed 

 at Bolton. 



Brit. Mus., Case 47. 



Magnesitic Ophiolite. The name pro- 

 posed by T. Sterry Hunt for those varieties 

 of Serpentine which contain Magnesite in- 

 timately mixed with the rock. 



Magneteisenstein, IVerner. Magnetic 

 Iron, Allan. Magnetic Iron-ore ; Mag- 

 netic Iron-stone, Jameson, Kirwan. See 

 Magnetite. 



Magnetic Pyrites, Jameson, Kinoan, 

 FhilUps. See Pyrrhotine. 



Magnetite, Haidinger. Cubical. Occurs 

 in regular octahedrons ; structure imperfectly 



Fig. 271. Fig. 272. Fig. 273- 



lamellar, parallel to the planes of the octahe- 

 dron. Also eat thy, compact, granular and 



