96 CORAL ORE. 



in acid, the uranium is supposed by Mr. 

 Whitney to be in the state of peroxide in- 

 stead of protoxide as in Pitch-blende. 



Coral Orb. A variety of Hepatic Cin- 

 nabar, from Idria, in Carniola, composed of 

 curved Lamellar concretions, Avith the form 

 and apparent structure of fossilized shells. 



Brit. Mus., Case 9. 



CORALINERZ, Werner. 



CoRDiEKiTK, Dufreiioy. The name given 

 by Haiiy to lolite, in honour of Cordier, the 

 geologist. 



CoRiNDON, Haiiy. See Corundum. 



CORNALINK, Brochcmt. CaRNELIAN. 

 CORNALINES DE ViEILLE RoCHE. The 



name given by lapidaries to clear trans- 

 parent varieties of Carnelian of a dark red 

 colour, and held in most esteem in conse- 

 quence of the richness of their colour, and 

 their hardness, which renders them suscep- 

 tible of a high polish. They are found in 

 the older rocks, and are chiefly brought 

 from Surat, in India. 



Corneous Lead Ore, Jameson. See 

 Crompordite. 



Corneous Manganese, v. Leonhard. 

 See Rhodonite. 



Corneous Mercury, Jameson. See 

 Calomel. 



Corneous Silver- ore, Kirwan. See 

 Kerargyrite. 



Cornish Diamond. The true Cornish 

 Diamond is a peculiar variety of Quartz, 

 differing in some respects in its crystalline 

 form ; it is usually covered with an opaque 

 coating of silica. These crystals were found 

 abundantly some years since in St. Just, 

 and at some of the mines in St. Agnes ; 

 they are qow very rarely found : but Rock 

 Crystals are sold as Cornish Diamonds. These, 

 De la Beche says, which are " commonly 

 known as Cornish diamonds, are sufficiently 

 transparent to be cut and set in brooches, 

 sealsj and other personal ornaments, though 

 far more rarely now than formerly, when, 

 judging from old jewelr}' preserved in some 

 Cornish families, the}^ would appear to have 

 been very often employed for these purposes. 

 We have seen very clear crystals from 

 thence of the usual form (a hexagonal 

 prism terminated by a hexagonal pyra- 

 mid), about three inches high and one inch 

 and a half thick. Cornish diamonds would 

 appear to have been esteemed and used for 

 personal ornaments in the time of Queen 

 Elizabeth, for Carew notices them, and ob- 

 serves that, though ' in blacknesse and in 

 hardnesse they come behind the right ones, 

 yet I have knowne some of them set on so 

 good a foile, as at first sight they might ap- 



CORUNDOPHILLITE. 

 pose a not unskilfull lapidarie.' (Survev of 

 Cornwall, 160-2, reprint of 1769, p. 7.) The 

 violet Rock Crystal, or Amethyst, seems 

 scarce; we have, however, seen a few 

 Cornish specimens, and among them some 

 which might have been advantageously 

 employed for personal ornaments if they 

 had not been more precious as raineralogi- 

 cal specimens." (Report on Cornwall, 

 Devon, and W. Somerset, by Sir H. T. 

 De la Beche, p. 496.) 



Cornish Tin-ore, Jameson. See Wood 

 Tin. 



CoRNWALLiTE, Zlppe. Amorphous. Colour 

 blackish or verdigris- green. Fracture con- 

 choidal, H. 4'5. S.G. 4-16. 



Comp. Arsenate of copper, or Cu5As + 

 51l = oxide of copper 55-37, arsenic acid 

 32-07, water 12'56 = 100. 



Analysis, mean of two, by Lerch : 

 Arsenic acid . . . . 30-21 

 Phosphoric acid . . .2-10 

 Oxide of copper . . . 54 61 

 Water 13-02 



100-00 

 BB on charcoal gives off fumes of 

 arsenic, and yields a globule of copper en- 

 veloped in a brittle crust. 



Locality. Cornwall: in small botryoidal 

 or disseminated masses of Olivenite. It 

 may be readily distinguished from Mala- 

 chite, by not efferverscing with acids. 



CoRUNDELLiTE, SilUman, A name given 

 to a supposed variety of Margarite, founded 

 on an incorrect determination of the silica 

 in the analyses of that mineral. 

 CoRUNDiTE. See Corundum. 

 Corundophillite, Shepard. Oblique. 

 Colour and streak dark leek-green passing 

 into grey and greenish black, with a pearly 

 lustre. Lamellar; thin laminae flexible, 

 but less so than Talc. Brittle. 

 Anah/sis, by Shepard : 



Silica 34-75 



Protoxide of iron . . . 31-25 

 Alumina .... 8-55 

 Alkalies and loss . . . 20-00 

 AVater 5-47 



100-00 

 BB alone, instantly blackens and melts at 

 the extremity to a shining black globule : 

 with borax effervesces and forms a clear 

 bottle-green glass. 



Localities. Near Asheville, Buncombe 

 county, North Carolina, in imperfectly stel- 

 late groups, and also spreading out into 

 laminae between layers of Corundum ; also 



