504 Scientific Intelligence. 



IIaanki.. Director. An investigation of the Coals of Canada, 

 with reference to their Economic Qualities. Extra Volume. 

 Weathering of Coal; by J. B. Pobter, assisted by S. L. Brunton, 

 and others. Pp. xii, 194, 6 pis., 65 figs. Ottawa, L915. 



The Coal Industry of Colorado; by Ralph W. Siiumway. 

 Colorado School of Mines Quarterly, vol. ii, No. 2, pp. 26-32. 



" The Cost of Coal " is the title of an important paper of 

 especial interest at the present time by George Otis Smith and 

 0. E. Leshcr of the IT. S. Geological Survey, read before the 

 American Mining Congress at Chicago on November 14. 



5. Notes on Radiolarian Cherts in Oregon : a Correction : 

 by Warrex D. Smith (communicated). — In the recent notes on 

 ""Radiolarian Cherts," published on pp. 299, 300 of the October 

 number, Cretaceous in the first paragraph should read Jura 

 Trias (?) Dr. Diller submitted his specimens to Dr. Hinde in 

 the British Museum, who recognized imperfect casts of radiolaria, 

 and, as I understand, it was he who assigned these rocks to that 

 age. I believe that I found some more determinable specimens, 

 and mv information merely confirms and amplifies that published 

 by Dr. Diller. 



6. JS T ew Mineral names ; by W. E. Ford (communicated — 

 continued from pp. 566-570, June, 1916). — 



Creedite. E. S. Larsen and R. C. Wells, Nat. Ac. Sc, ii, 

 36o, 1916. — In grains and poorly developed prismatic crystals. 

 Probably monoclinic. Nearly colorless. H. = 3-5. G. = 2-73. 

 Perfect cleavage parallel to the elongation of the crystals and 

 bisecting the obtuse angle of the prism. Cleavage fragments 

 show parallel extinction with the emergence of an optical axis 

 nearly normal to the cleavage plane. Sections cut in the pris- 

 matic zone at right angles to the cleavage show extinction angles 

 of 41° and the emergence of the bisectrix Y, with irregular twin- 

 ning. Refractive indices, a = 1*461, /3=l - 478, y = 1-485; 

 2V Na (meas.) = 64° 22',. Comp.— CaS0 4 .2CaF 2 .2Al(F.OH) 3 .2H.p. 

 Fusible with intumescence to a white enamel, giving the calcium 

 flame. Slowly but completely soluble in acids. Found at a flu- 

 orite-barite vein near Wagon Wheel Gap, Colorado. Intimately 

 associated with a dull white kaolinite and barite. Named from 

 the Creed Quadrangle in which it is found. 



Hibbeilite. A. H. Phillips, this Journal, xlii, 276, 1916. — 

 Orthorhombic. Tabular parallel to a(100). a :b:c = 0-589 : 1 : 

 0-488. Forms present, a(100), 6(010), s(120), p(lll), d(101). 

 Cleavage parallel to the three pinacoids. G. = 3-21. H. = 3-75. 

 Birefringence weak. Optically—. Comp. — 2Zn 3 (P0 4 ) 2 .Zn(OH) 2 . 

 6 1/2 H s O. Easily fusible. Decrepitates in the closed tube, 

 yielding water. Found with spencerite at Hudson Bay Mine at 

 Salmo, B. C. Named after Pres. Hibben of Princeton. 



Leifite. O. B. Boggild, (Medd. om Gronland, li, 429, 1915). 

 A silicate from Greenland with the composition Na 2 Al 2 Si a 22 .2NaF. 

 A complete description of this mineral has not as yet been avail- 

 able. 



