230 MARIOXITE. 



Localities. Marmato in Popayan. Bottino 

 near Serravezza in Tuscany. 



Marionite, Elderhorst. The variety of 

 Zinc-bloom from Marion co., Arliansas. 



Makbiolite, Nuttall, Beudant, Dufre- 

 noy, Alla?i. A thin foliated variety of Ser- 

 pentine, occurring in translucent or opaque 

 masses of a pale green colour : sometimes 

 nearly white. Lustre pearly. Folia brittle 

 and separable. S.G. 2-41. 



Comp. Mg5, Si2, H4. 





Analysis, by Lychnell: 





Silica .... 



. 41-67 



Magnesia . 



. 41-25 



Protoxide of iron 



. 1-64 



Carbonic acid 



. 1-37 



AYater .... 



. 13-80 



99-73 

 Localities. Hoboken in New Jersey, 

 associated with Brucite, Magnesite, &c. 

 Blandford, Massachusetts, U.S., with Schil- 

 ler Spar. 



Name. From A4«f^«/'ga^, to shine. 

 When the laminae are not separable it is 

 sometimes miscalled Kerolite. 



Martial Aeseniate of Copper. Al- 

 lan, Jameson. See Scorodite. 

 Martial Pyrites. See Pyrites. 

 Martinsite, Karsten. A variety of Com- 

 mon Salt, from Stassfurth, containing 9-02 

 per cent, of sulphate of magnesia. It gives 

 out a bituminous odour when rubbed, and 

 dissolves in water with a very slight eifer- 

 vescence. 

 Analysis ,° 



Chloride of sodium . . 90*30 

 Sulphate of magnesia . . 9-02 

 Sulphate of lime . . . O'oO 

 Alumina and . . . | ^.^a 

 Peroxide of iron . . . j 



100-02 

 Name. After Captain Martin of Halle. 

 Martite, Breithaupt. Cubical. Occurs 

 in regular octahedrons, which are often 

 flattened, and have their faces striated 

 parallel to the edges. Cleavage indistinct. 

 Colour iron-black, sometimes with a bronze 

 tarnish. Lustre submetallic. Streak red- 

 dish brown. Fracture conchoidal. H. 6. 

 S.G. 4-6 to 5-33. 



Comp. F^e = iron 70, oxygen 30 = 100. 



Localities. Framont. Auvergne. Vesu- 

 vius. Peru. Brazil. Munroe. New York. 

 See Eisenanatas. 



Mascagnin, Karsten, Reuss. Mascag- 

 NiNEj Dana. Rhombic. Generally occurs 



MATLOCKITE. 



stalactitic, pulverulent, or in mealy crusts. 

 Colour greyish, or yellow. Lustre of crystals 

 vitreous. Translucent or opaque. Taste pun- 

 gent and bitter. H. 2 to 2-5. S. G. 1'72 to 1-73. 



Fig. 



Comp. Si^phate of ammonia, NH% S + 



2H = sulphuric acid 52-33, ammonia 34-67, 

 water 12-00 = 100. 



Readily soluble in water. Attracts mois- 

 ture from the atmosphere, and is entirely 

 volatile at a high temperature. 



Localities. In fissures in the lavas of 

 Etna and Vesuvius, and the Lipari Isles. 

 The lagunes near Sienna in Tuscany. 



Nam.e. After Professor Mascagni, by 

 whom it was discovered. 

 Masculine. See Gem. 

 Masonite, C. T. Jackson. A variety of 

 Chloritoid. Colour black. Lustre pearly. 

 H. 6. S.G. 3-52. 



Analysis, by Whitney ; 



Silica 28-27 



Alumina .... 32-16 

 Protoxide of iron . . . 33-72 

 Magnesia . . . .0-13 

 Water 5-00 



99-28 

 Locality. Near Natic Village, Rhode Is- 

 land ; in compact argillaceous states. 

 Brit. Mus., Case 33. 



Matlockite, R. p. Greg. Pyramidal: 

 primary form a right square prism. Occurs 

 in tabular crystals with an imperfect basal 

 cleavage- Colour yellowish, sometimes 

 slightly greenish. Lustre adamantine, occa- 

 sionally pearly on planes of cleavage. 

 Transparent to translucent. Fracture un- 



even and slightlv conchoidal. H, 2-5 to 3. 

 S.G. 7-21. 



