RETINITE. 



Analysis, by Hatchett ; 

 Resin, eoluble in alcohol . . 55 

 Insoluble bituminous matter . 41 

 Earthy matter .... 5 



99 

 Melts -when placed on red hot iron, 

 smokes, and burns with a bright flame, and 

 a fragrant odour. 



Soluble in alcohol, leaving an unctuous 

 residue. 



Localities. Bovey Tracey, in Devonshire, 

 with Lignite. Halle. Osnabriick, in Ha- 

 nover, forming a layer in peat. Cape Sable. 

 Brit. Mus., Case 60. 



3I.P.G. Horse-shoe Case,Nos.l07 and 115. 

 Eetinite du Cantal. See Cantalite, 

 Eetinite Perle. The name given by 

 Cordier to the paste of those kinds of Pitch- 

 stone which, instead of presenting crystals 

 like that of Cantal (see Cantalite), con- 

 tain rounded nodules, or Spherulite (see 

 Pearlstoxe). 



Retzite. a red zeolite, from ^delfors, 

 in Sweden, considered by N. J. Berlin to be 

 a variety of Laumontite (allied to the red 

 zeolite from Upsala), more or less disinte- 

 grated, and rendered impure by an admix- 

 ture of Quartz. It is named after Retzius, 

 by whom it was analysed, with the follow- 

 ing results : 



Silica 60-28 



Alumina .... 15"42 

 Peroxide of iron . . . 4*16 



Lime 8-18 



Magnesia and peroxide of 



manganese . . . 0*42 

 Water 11-07 



99-53 

 It is of a white, light grey, or reddish 

 colour, and translucent at the edges. H. 6. 

 S.G. 2-5. 

 BB fuses with intumescence. 

 Dissolves in acids, forming a jelly. 

 Reussin, Karsten ; or Reussite, Phillips. 

 Anhydrous sulphate of soda and magnesia, 

 occurring in white, flat, six-sided crystals, 

 and in acicular crystals, forming radiating 

 groups, near Seidlitz and Saidschutz, in 

 Bohemia ; also in mealy efflorescences. Taste 

 saline and bitter. Shining. Fracture con- 

 choidal. 



Analysis, bv Reuss : 



Sulphate^of soda . . . 66-04 

 Sulphate of magnesia . . 31-35 

 Chloride of calcium . . 2*19 

 Sulphate of lime . . .0*42 



100-00 



RHODOISE. 317 



Name. After Reuss, the Austrian mine- 

 ralogist. 



Khodalose, or Rhodhalose, Beuda^it. 

 (From fo^oii;, rose, and a^o?, salt.) Red or 

 cobalt vitriol. See Biebrite. 



IJhodium Gold. Gold containing from 

 34 to 43 per cent, of rhodium. 



Rhodizite, G. Rose. A lime-boracite 

 found in minute, translucent, and shining 

 crystals, on red Tourmaline" and Quartz, 

 near Mursinsk, in the Ural. Colour white, 

 inclining to j^ellow or grey. H. 8. S.G. 

 3-3 to 3 42. 



Fiff. 360. 



BB fuses with difficult}^ at the edges to a 

 white opaque glass, tinging the flame green, 

 then green above and red below, and finally 

 altogether red ; hence the name from pohi^uy, 

 to make red. 



Brit. Mus., Case 39. 



Rhodochrome, G. Rose, Fiedler. A mas- 

 sive or tine scaly variety of Kammererite, 

 of a greenish-black colour, but peach-blos- 

 som-red in fine splinters. Fracture splintery. 

 H. 2-5 to 3. S.G. 2-668. , 



nalysis, by Hermann : 





Silica .... 



. 34-64 



Alumina 



. 10-50 



Peroxide of iron . 



. 2-00 



Oxide of chrome . 



. 5-50 



Magnesia . 



. 35-47 



Water .... 



. 12-03 



100-14 



BB fuses at thin edges to a yellow 

 enamel ; with borax yields a green glass. 



Soluble with diflSiculty in muriatic acid. 



Localities. Island Tino, in Greece, Bis- 

 sersk and Kyschtimsk, in the Ural. Kraul, 

 in Styria. 



Name. From poho;, a rose, and xi'^!^", 

 colour. 



Brit. Mus., Case 25. 



Rhodochrosite, (from po^ox^oo;, rose- 

 coloured.) See Diallogite. 



Rhodoise, Beudant. Rhodonite, Dana, 

 Nicol. Oblique, and, like Pyroxene, with 

 a cleavage in three directions, two of which 

 are perpendicular to each other. Generally 

 found massive and crystalline or granular. 

 Colour rose-red or reddish-brown. Trans- 

 lucent. Lustre vitreous. Very hard. Streak 

 white. Brittle. Fracture flat-conchoidal or 

 uneven. H. 5*5 to 6. S.G. 3-4 to 3-68. 



