Sc ten tific In te I ligen ce — Miner a logy . 



181 



MINERALOGY. 



4. On Pseudomorphous Minerals. By our friend, Professor 

 Sillem. — (Browns Jahrb., 1851,385.) — The- pseudomorphous 

 forms described in this paper are — 



Forms imitated. Pseudomorphs. Forms imitated. 



Red copper ore. Scheelite, . . Wolfram. 



Red silver ore. Malachite, . . Copper pyrites, 



Red copper ore. Fahlerz, Calcite. 



Electric calamine, Blende, Psilome- 

 lane, Fluorspar. 



Pseudomorphs. 

 Native copper, 

 Silver glance, , 

 Malachite, . . 

 Azurite, , . 

 Copper pyrites, 

 Copper glance, , 

 Horn silver, 

 Brown iron ore, 

 Wad, . . .. , 

 Gypsum, . . 

 Bitter spar, . 

 Kaolin, 

 Mica, . . . 

 Talc, . . . 

 Soapstone, . 



Galena, . . . 

 White lead ore, 

 Red and brown 

 iron ore, . . 



Fahlerz. 



Copper pyrites. 



Silver. 



Red iron ore. 



Pyrolusite. 



Calcspar. 



Leucite, Sodalite. 



Wernerite. 



Kyanite. 



Tourmaline, Acti- 

 nolite, Scapolite, 

 Kyanite, Stauro- 

 tide. 



Pyromorphite. 



Galena. 



Calamine, 

 Calcite, . 



Quartz, . 



Chlorite, 



Galena, . . 



Specular iron, 



Marcasite, 



Sphaerosiderite, 



Pyrites, . . 



Pinite, 



Antimony blende, Antimonite. 



Magnetic iron, . Actinolite. 



Green earth, . Prehnite. 



Talc, .... Actinolite. 



Felspar, Pyrope 

 Garnet. 



Fluorspar, Calcite, 

 Wolfram, Au- 

 gite, Carbonate 

 of lead, Corun- 

 dum, Stiblite. 



Calcite, Magnetic 

 iron, Brown ore. 



Calcite. 



Calcite. 



Stephanite. 



Calcite. 



Marcasite. 



Hornblende. 



. Pyrites, Specular 

 iron, Sphaerosi- 

 derite. 

 Brown iron ore, Marcasite, Calcite, 

 Beryl. 



— (American Journal of Science and Arts, vol. xiv., No. 41, 2d 



Series, p. 264.) 



5. Large Deposit of Graphite. — In Glen Strath, Farer, Inver- 

 ness-shire, there is a great deposit of graphite in gneiss. A similar one 

 occurs at St John's, New Brunswick ; near the new suspension bridge 

 over the St John's river, a very extensive deposit of graphite has been 

 opened and explored to a considerable extent. The vein, or bed, as it 

 might more properly be called, is nearly vertical, and inclosed between 

 beds of highly metamorphic schists. It is entered near the water, on 

 the face of a precipitate cliff about 70 feet high, the walls of the 

 lode being in the main parallel to the graphite deposit. This bed has 

 been explored by a gallery or adit levtl over 100 feet, and by cross 

 cuts, at right angles to this, some 20 or more feet. All these are in 

 the graphite mass, and of course the floor and roof of the levels are 

 of the same mineral. The quartzose walls have occasionally ap- 

 proached, and, in some cases, masses of quartz or schist have been 

 included in the graphite. The course of this deposit is about north- 

 east and south-west, or nearly in the direction of the strike of the 

 strata of the schist. The graphite is not of a very superior quality as a 

 mass, though portions of it are quite pure. As yet no solid and per- 



