.-.METALS. 96. Magnefium. 2^7i 



mav be obtained from an ounce of the oxvde : it contains 

 f'om 30 to 45 per cei t. of oxyde of nianganele, from 30 to 

 40 of oxvgeiie, and fmall quantity of oxyde of iron, carbo- 

 nate of Jime, barytes and lilica. 



nigra. Soft, ll:aining the fingers, black with hardly any ludrc. 



Magnelia fcoriacea, Cron!} m:n . 116 2 a. 



Magnefia fcoriacea. Wall J\li. \. p. 329 n. 2. b. 



Black or brown manganefe. Kir<Txa'i miner. 2. p. 292. 



Bl^cic calciform n)an,i;;^nere. . Sch^ie'.Jl'er min. 2, p. 253. 



Black ore of manganeie. Thomfon chern. 4,/> 112, 



Found commonly in the mines containing the grey ore, mafTivc, 

 invdling, or variouflv ifr.itative: colour black or dark brown, 

 fometimes with a bluilhcaii, and often varioufiy coloured on 

 the iurface: texuire earthy, compafl, even or flightly con- 

 choidal : in its compofition it refcn-.hles the laft, but contains 

 more iron : its cryilals are ufually ^-fided prifms wiih their 

 faces Imooth, 



/'i'/r<2ro//w/. Hard lib, flaining the fingers, blackilh, fliining internally, 

 becoming red when heated. 



Magnefia conipafra. Wall fy ft. \,p^ 330. n. 3. 



Pengord llonc. Kirivan mineral. 2. /». 295. 



Found at Peri cr^ni in Franc£, foftini, of a compa(fl: texture, and 

 bro\vnifh-black colour: when heated it hardens and becomes 

 rcddifn-brovvn, but not magnetic, and gives a red or violet 

 tinge to borax: beiidcs manganefe it contains alumina and 

 iron. 



rosea* Pale rofy red, foliated, not ilaining the fingers, eafily 



meltin^r with eifcrvefcenqe. 



Red ore of mirgsneJe. Kir'zvan fninera'. 2, p. 297. 



Reddifl"!- white ox} dated manganefe. SchmeiJJer 2. f. 254. 



Red (jre of manganefe Thomjon chem. 4^. p. \ \ 2. 



Found in v..q Nagvc.g mines ot Tranplnjania^ where it is the ma- 

 tiix of gold, and near Kapnik in Hungary ^ malnve", loofe, 

 diiierainated, or imitative, fometimes cryilallized in rhom- 

 boidal prifms or needles : texture foliated in thin incurved 

 layers, with th;." fragments often fpliniery : colour pale roiy 

 rcJ mixed with white, powder whitifli : it eftcrveices with 

 nitric and muriatic acids^ becomes reddilb-brown when 

 heated to redneis, and tinges borax red : fpecific grivity 

 3,233: contains, filica 55, oxyde of manganefe 35, oxyde 

 .4>f iron 7, and about 2 of alumina. Ruprecbu 



Qji 2 



