234 MINERALOGY. 



specimens from St. Symphone, and on one from the newly discovered 

 locality in Cornwall. The last occurred in thin isolated sulphur-yellow 

 rhombic tables. The author concludes that the unaltered native 



crystals contain : — ^ 2 ^ I pp^ ^ iq H^O. But when dried in vacuo 



8 molecules of water are lost, corresponding to 15-18 p. c. The author 

 considers that drying minerals in vacuo may remove essential water and 

 not accidental moisture only. The closely allied mineral Torbernite did 

 not yield analogous results. F. W. R. 



Church, Prof. A. H. Short Notices of some Cornish Minerals. 

 Chem. Neius, vol. xxxi. p. 153. 



Describes : — 1. A pink variety of steatite, found on analysis to be a 

 hydrated magnesium silicate represented by the formula 3MgO . H^O . 

 4Si02 ; 2. A nearly white crystalline mineral containing much water, 

 some fluorine, and a good deal of silica and ferrous oxide, but not 

 identified with any known species ; 3. Analysis of native gold of 

 Ladock ; 4. Analysis of an old specimen of fihform native silver from 

 Huel Herland. F. W. E,. 



Chydenius, J. J. Undersokning af fossilt hartz fran Gronland. 



[Eossil Resin from Greenland.] Geol. foren. Stockhohn Fork. 



Bd. ii. no. 27, pp. 549-551. 

 Analysis given. 



Collins, J. H. Mineralogical Notices. Journ. R. Inst. Cornwall, 

 no. xvi. pp. 50-52. 



Mentions some new localities in Cornwall and Devon for garnets, 

 axinite, fluor, jasper, toad's-eye tin, lithia-mica, carbonate of lead, 

 pseudomorphs of cassiterite after bismuthite, and vivianite. An 

 analysis is given of the garnets from Perranzabuloe. G. L. N. F. 



. Notes on a Cornish specimen of Wavellite. Journ. Ii, Inst. 



Cornwall, no. xvii. pp. 153 ; also Chem. News, vol. xxxii. p. 241. 

 Confirms the statement of Greg and Lettsom that Wavellite occurs 

 at Stenna Gwyn, near St. Austell. 



. Crystallography. Chem. News, vol. xxxii. p. 248. 



Partial reply to Mr. Eead win's queries, p. 2bb. 



Cooke, [Prof.] Josiah P., Jun. Melanosiderite : a new mineral 



species from Mineral Hill, Delaware County, Pennsylvania. Proc. 



Amer. Acad. vol. x. pp. 451, 452. 



Melanosiderite is a compact and amorphous mineral of striking black 



colour. H=4-5. S.G. = 3*39. Analysis leads to the formula : 4^6203 . 



SiO^ . 6H2O. It is clearly related to the sesquihydrates of iron, from 



which it difi'ers notably in sp. gr. F. W. R. 



Cooke, [Prof.] J. P., and F. A. Gooch. On Two New Varieties of 

 Vermiculites, with a revision of the other members of this group. 

 Phil. Mag. vol. 50, pp. 135-143 ; Proc. Amer. Ac. vol. x. pp. 453-462. 



Two new varieties have been obtained since the publication of the 



