118 



RHODOPHYLLITE. 



Comp. Manganese-Augits, or Mn^ 81^ = 

 protoxide of manganese 54'1, silica 45'9 = 

 100. 



Analysis, from Langbansbytta, by Ber- 

 zelius : 



Silica 48-00 • 



Protoxide of manganese . 49-04 

 Lime ..... 3-12 

 Magnesia . . , .0-22 



100-38 



BB alone, on charcoal becomes dark 

 brown, and fuses to a reddish-brown or 

 black globule. With borax forms a violet- 

 coloured glass. 



Partially soluble in muriatic acid, when 

 reduced to powder, and the insoluble residue 

 becomes white. 



Localities. — Eriglish. A manganese quarry, 

 S. E. of Callington in Cornwall. Upton 

 Pyne and Black Down, Devonshire. — 

 Foreign. Langbansbytta in Sv/eden, in beds 

 of iron ore. Katharinenburg in Siberia, in 

 clay-slate. Elbingerode, in the Harz. New 

 Jersey. 



Name. From poZov, a rose, in allusion to 

 its colour. 



Rhodonite is used, when cut and polished, 

 for inlaid work. 



Brit. Mus. Case 13. 



iJf. Kg. ' Wall-cases IB (British); 20 

 (Foreign). Horse-shoe Case, No. 1015. 



For varieties, see Allagite, Bustamite, 

 Dyssnite, FowLERiTE, Marceline, Opsi- 

 MOSE, or Hydro-silicate of Manganese, 

 Paisbkrgite, Photizitb. 



Rhodophyllite, Genth. See Pyro- 



SCLERITE. 



Rhoetizite. a nearly white or some- 

 what reddish vai'iety of tvyanite, occurring 

 in aggregated masses at the Ptitsch-thal, in 

 the Tyrol. The name Rhoetizite has refer- 

 ence to the Rhoetian Alps, where this mine- 

 ral is found. 



Rhomb Spar, Jameson. bee Bitter 

 Spar. , 



Rhombenglimmer, Kengott, A variety 

 of Biotite, found in lai'ge and very regular 

 rhombic prisms, and in tetrahedral pyramids, 

 at Greenwood Furnace. Monroe, New York. 



Rho.mbic Mica. See Phlogopite. 



Rhombohedral Alum Haloid, Mohs. 

 See ALU3ISTONE. 



Rhojibohedral Antimony, 3Iohs. See 

 Native Antimony. 



Rhombohedric Eutoivie Glance, Jib/is. 

 See Tetrady^mite. 



Rhombohedral Arsenic, llohs. See 

 Native Arsenic. 



RIBBON JASPER. 



Rho:mbohedral Calamine, Jameson. 

 See Calamine. 



Rhombohedral Cerium Ore, Mohs. 

 See Cerite. 



Rhombohedral Corundum, Ifohs. See 

 Corundum. 



Rhombohedral Emerald, 3Iohs. See 

 Emerald. 



Rhombohedral Emerald Malachite, 

 3Iohs. See Dioptase. 



Rhombohedral Euchlore - mala- 

 chite, 3Iohs. See Chalcophyllite. 



Rhombohedral Felspar, Mohs. See 

 Nepheline. 



Rhombohedral Fluor Haloid, Mohs. 

 See Apatite. 



Rho;mbohedral Graphite Mica, Mohs. 

 See Graphite. 



Rhombohedral Iridium, Mohs. See 

 Iridosmine, 



Rhombohedral Iron Ore, 3Iohs. See 

 Hebiatite. 



Rhombohedral Iron Pyrites, Mohgr 

 See Py'rrhotine. , 



Rhombohedral Kouphone Spar, Mohs. 

 See Chabazite. 



Rhombohedral Lead Baryte, Mohs. 

 See Mimetite, 



Rhombohedral Kupkon-mica, Mohs. 

 See Brucite. 



Rhombohedral Melan Mica, 3fohs. 

 See Cronstedtite. 



Rhombohedral Molybdena Glance. 

 Mohs. See Sulphide of Molybdenu^i. 



Rhombohedral Pearl Mica, Mohs. 

 See Clintonite. 



Rhombohedral Quartz, 3Iohs. See 

 Quartz. 



Rhombohedral Ruby^ Blende, 3Iohs. 

 See Pyrargyrite. 



Rhombohedral Talc Mica, Mohs. See 

 Mica. 



Rhombohedral Tourmaline, Mohs. 

 See Tourmaline. 



Rhombohedral Zinc Baryte, Mohs. 

 See Calamine. 



Rhomboidal Arseniate of Copper, 

 Phillips. See Chalcophyllite. 



Rhomboidal Baryte, Jameson. See 

 Witherite, 



Rhomboidal Graphite, Jameson. See 

 Graphite. 



Rhojiboidal Pearl Mica, Jameson. See 

 Margarite. 



Rhyacolite, Rose. See Ryacolite. 



Ribbon Jasper. A variety of Jasper 

 exhibiting green, red, and yellow colours, 

 of various shades, arranged in stripes or 

 parallel layers; whence the name Ribbon 



