Edinburgh New Philosophical Journal (1839 Edinburgh New Philosophical Journal edinburghnewphil28edin Year: 1839 - 1840 â '«*^'«(6 136° 40'; ac 118'; ad 90»; 6' e about 176^ a salient' angle resulting, I conclude, from the composition of two crys- tal.'' â ' ''' ilJiv/ ^aohulv '\o Iff , ^ ^ , vA ///MWW â .'xUiiua . // rioii ' No. 2 is evidently a compound crystal, but I must have better means than the single crystal has aiforded, to be en- abled to discover the primary form. I do not observe any ' rings in looking perpendicularly through a and the parallel plane, which, although the crysta
Edinburgh New Philosophical Journal (1839 Edinburgh New Philosophical Journal edinburghnewphil28edin Year: 1839 - 1840 â '«*^'«(6 136° 40'; ac 118'; ad 90»; 6' e about 176^ a salient' angle resulting, I conclude, from the composition of two crys- tal.'' â ' ''' ilJiv/ ^aohulv '\o Iff , ^ ^ , vA ///MWW â .'xUiiua . // rioii ' No. 2 is evidently a compound crystal, but I must have better means than the single crystal has aiforded, to be en- abled to discover the primary form. I do not observe any ' rings in looking perpendicularly through a and the parallel plane, which, although the crystal is only translucent, I think t should do if the primary form were a rhomboid, or Aom- bohedron as now called. The lines represented on the faces' of No. 2. present bold salient and re-entering angles. The ' only appearance of cleavage, I have found in breaking the sma-11 crystal, is parallel to the lateral planes d of the hexago- nal prism, but I am not certain that these are more than planes of composition of intersecting crystals,' '.ui ua CItemical Examination of Greenockite., or Sulphuret of Cadhm- uin. By Arthur Connell, Esq., (Communieated ' by the Author). :'.. A fragment of Greenockite, heated in a glass tube, decre-- pitated and acquired a fine carmine red colovu, and, on cool- ing, recovered its vellow tint. At a red heat it did notfusd ' or volatilize. It gave off no moisture. ', In powder, it was readily soluble in heated muriatic acid, Avith strong odour of sulphuretted hydrogen. Carbonate of soda caused a white precipitate soluble in ammonia. The mu- ; riatic solution, by evaporation, afforded a white prismatic crys-'^ tallization, not deliquescing in an ordinary atmosphere. This character distinguished the mineral from zinc-blende, which it resembles, and supjrested the idea that it might be stdphftj^.
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