316 REDRUTHITE. 



of paint, experience having proved it to be 

 admirably adapted for painting the bottoms 

 of ships. Tlie coarser varieties are made 

 into pencils, Avhich are used by carpenters' 

 and the liner kinds into crayons for artists' 

 but to a less extent now than was the case 

 a few years ago, when drawing in red chalk 

 was more practised than it is at the pre- 

 sent day. For these purposes it is either 

 used in its natural, state, or it is ground, 

 ■washed, and mixed with gum, to give it the 

 necessary hardness, and then cast in moulds. 



A Eeddle is found about twelve miles 

 from Ivotheram, in Yorkshire, which is the 

 best material known for polishing optical 

 glasses. 



Redruthite. a name proposed, by 

 Brooke & Miller, for Copper Glance, on the 

 erroneous supposition that the best speci- 

 mens of that mineral are obtained from the 

 mines in the neighbourhood of Redruth, in 

 Cornwall. 



Refikite. Forms tubercles and small 

 veins in Lignite. Structure fibrous-radi- 

 ated. Colour wax-white. Lustre between 

 resinous and greasy. Soft; scratched by 

 Gypsum. Breaks between the lingers, and 

 is easily reduced to powder. Fracture 

 amorphous. 



Comp. Carbon 78, hvdrogen 11, oxygen 

 11 = 100. 



Melts at 180° F. Soluble in boiling alco- 

 hol, and disappears altogether in a weak 

 and boiling solution of potash. 



LocaUty. The Abruzzi, in Naples, in 

 macigno. 



Name. After Refik Bey. 



Remingtonite, J. C. Booth. A hydro- 

 carbonate of cobalt, occurring as a rose- 

 coloured coating, one hundredth of an inch 

 in thickness. Very soft and eartiiy. Opaque, 

 Avith a pale rose-coloured streak. 



It is met with at the copper mine near 

 Finksburg, Carroll County, Maryland, coat- 

 ing thin veins of Serpentine, which traverse 

 Hornblende and Epidote, and is associated 

 with Serpentine, Hornblende, Epidote, Car- 

 bonate of lime, and CarroUite. 



It is named after Mr. Edward Reming- 

 ton, under whose immediate supervision the 

 jnines are where it is found. 



Rejmolimite, Brooke S^' Miller. Atacamite, 

 so named from its occurrence at Los Remo- 

 linos, in Chili. 



Rensselaerite, Emmons. A steatitic 

 mineral Avith a fine compact texture, and 

 an vmctuous feel. Colour grey, whitish, 

 greenish, and sometimes brownish or black. 



RETINITE. 

 Translucent. H. 2-5 to 3. S.G. 2-75 to 

 2-87. 



Comp. Like that of Talc. 



Analysis, from Grenville, by T. S. Hunt 



Silica 61-60 



Magnesia .... 31-06 

 Protoxide of iron . .1-53 

 Water 5-60 



99-79 



Localities. Over large areas in Northern 

 New York, U. S. ; Grenville, Upper Canada ; 

 also at the rapids of the Peribanka, associ- 

 ated with Labradorite rock. 



According to Beck, the crystals are pseudo- 

 morphs of Pyroxene. 



It is Avorked in the lathe into inkstands 

 and other articles. 



Name. After Stephen Van Rensselaer. 



Resinite, Haiiy. -\ See Retin- 



Retinasphalt, Molis, ite. The 



Phillips. >name Retin^ 



Retinasphaltum, ^a<- asphaltumwas 

 chett. J given b}'' Hat- 



chett, in the belief that the mineral from 

 Bovey Tracey was composed of a resinous 

 substance, and a substance resembling As- 

 phalt. 



Retinalite, Thomson. A massive variety 

 of Serpentine, with a resinous appearance. 

 Colour honey-yellow to oil-green. Trans- 

 lucent. Lustre resinous. Fracture splinterv. 

 H. 3-5. S.G, 2-49. to 2-53. 



Analysis, from Grenville, by T. S. Hunt .- 

 Silica . . . . ■ . 40-10 

 Peroxide of iron . . . 1-90 

 Magnesia . . . .41-65 



Lime 0-90 



Water 15-00 



99-55 



BB infusible, but whitens and becomes 

 friable. 



Localities. Grand Calumet Island, on the 

 Ottawa; and Grenville, Upper Canada. 



Name. From pirlvn, resin, from its re- 

 semblance to that substance. 



Retin-allophane, 3Iohs. See Pitti- 



CITB. 



Retin-baryte, Mohs. See Triplite. 



Retinite, Beudant. See Pitchstone. 



Retinite, Haidinger, v. Leonhard. A 

 mineral resin, found in roundish or irregular 

 lumps. Colour yellowish to pale brownish- 

 yellow. Opaque. Lustre glistening or resin- 

 ous ; often earthy externally. Soft, and 

 vevy easily frangible. Fracture uneven or 

 imperfect-couchoidal. H. 1 to 2*5. S.G. 

 1-1 to 1-2. 



