814 RASENEISENSTEIK 



BB whitens, becomes opaque, and fuses 

 at the edges. 



Locality. Perth, Upper Canada. 



Brit. Mus., Case 33. 



Easeneisenstein. See Bog Iron-ore. 



Eatoffkit, John. A granular or earthy 

 blue variety of Fluor, rendered impure by 

 an admixture of clay from Eatoffka, in 

 Eussia. 



Eauchkalk. a variety of Dolomite, 

 occurring in the Zechstein of North Ger- 

 many. 



Comp. Ca C + Mg C. 



A.nalysis, by Rammehberg . 

 Carbonate of lime 

 Carbonate of magnesia 

 Carbonate of iron 



. 55-62 

 . 42-40 

 . 0-56 



98-68 

 JVerner, 



See 



Eauschgelb, Hausmann, 

 Orpiment. 



Eautenspath. See Ehomb-spar. 



Eazoumoffskin, John. A clayey mineral 

 from Kosemutz, in Silesia. 



Comp. M Si3 + 3H. 





Analysis, by Zellner : 





- Silica . . 



. 54-50 



Alumina i 



. 27-25 



Lime . 



, 2-00 



IMagnesia 



. 0-37 



Protoxide of iron . 



. 0-25 



Water . 



. 14-25 



98-62 



Eealgar, Kirwan, Phillips ; or Eealgar 

 EouGE, Brochant. Oblique, Occurs in pris- 

 matic crystals, streaked longitudinally and 

 shining ; also massive, disseminated, invest- 

 ing. Colour aurora-red, of various degrees 

 of intensity. Translucent to opaque ; semi- 

 transparent in crystals. Lustre resinous. 

 Steak lemon- or orange-yellow. Sectile. 

 Yields to the pressure of the nail. Fracture 

 conclioidal to uneven. Becomes negatively 

 electrical by friction. H. 1-5 to 2. S.G. 3-4 

 to 3-G. 



Fig. 356. 



Comp. Bisulphide of arsenic. As 8^ = 

 arsenic 70-07, sulphur 29-93 = 100- 



RED COPPEE. 



Analysis, from Pola de Lena, in Asfcuria, 

 Spain, by Dj: Hugo Mailer : 



Sulph-ar .... 30-00 

 Arsenic .... 70-25 



100-25 



BB easily fusible. Burns in the air with a 

 blue flame, forming sulphurous and arsenious 

 acid, and usually leaving an earthy residue. 



Localities. The most noted localities are 

 Felsobanya, in Upper Hungary, and Kapnik 

 and Nagyag, in Transylvania. It is also 

 found at Andreasberg,in the Harz ; Joachims- 

 thal, in Bohemia; Schneeberg, in Saxony; 

 Suabia ; St. Gotthard, in Switzerland, in 

 Dolomite ; Guadaloupe ; Vesuvius, and the 

 Solfatara, in minute crystals. 



Artistically prepared Eealgar is used as a 

 pigment, and was also employed by the 

 ancients for the same purpose, under the 

 name of Sandarach, or 'S.c/.vloe.^a.zr,, The 

 Chinese are said to form cups from Eealgar, 

 in which they let stand lemon-juice, which 

 they afterwards drink as a purgative. See 

 3L P. G. Case 23. 



It is distinguished from Eed Silver-ore 

 by its lower specific gravity and orange- 

 coloured streak, and from Eed Lead- ore by 

 its lower specific gravity. 



Name. Used by the Alchemists. 



Brit. Mus., Case 12. 



M. P. G. Principal Floor, Wall-case 23 

 (Foreign). 



Eealgar-jaune, Brochant. 



MEKT. 



Eed Antimony, Phillips.^ 



Eed Antimonial Ore, [ 

 Kirwan. ^ 



Eed Antimony - ore, | 

 Jameson. j 



Eed Chalk. An earthy kind of Hema- 

 tite. See Eeddle. 



Eed Cobalt Ochre, Jameson. See 

 Erythrine. 



Eed Copper, Dana; or Eed Copper 



See Orpi- 



See 

 Kermbsite. 



Fig. 357. 



Fig. 358. 



Fig. 359. 



Ore, Jameson. Cubical. Occurs crystallized 

 in the form of the octahedron and its modi- 



