MINERALOGY. G95 



It is also shown that the well-known but enigmatical " bailey corn" 

 pseudomoiphs after calcite from Sangerhausen very probably had the 

 same origin. 



Still another case of pseudomorphism recently studied in detail is 

 that of the rare mineral leucite, which is shown by Sauer to occur in 

 an altered form extensively in the leucitophyr of the Saxon Erzgebirge. 

 It is not found in a fresh state, but changed on the one hand to aual- 

 cite and on the other to orthoclase and muscovite. Pseudomorphs of 

 orthoclase from Magnet Cove, Arkansas, having the iorm of the familiar 

 tetragonal trisoctahedrou of garnet and leucite (2-2), have been referred 

 to leucite by G. F. Kunz, but the subject requires further study before 

 this suggestion can be accepted. 



Of memoirs on the chemical compositiou of minerals, that by Eam- 

 melsberg on the scapolites deserves mention first. It follows the ijaper 

 of Tschermak on the same subject, and while not removing all the difii- 

 culties from this most complex subject, it has at least the advantage 

 that it does not deal so much with hypotheses as with facts. So far as 

 can be explained in brief, his conclusion is that the various members 

 of the scapolite group are to be regarded as combiuations of the normal 

 or meta silicates (bisilicates) NaiSiO^, CaSiOa, AlaSigO,, ; of the ortho- 

 silicates (unisilicates) Na4Si04, Ca^SiO^, AlgSiaOi^, and of the subsili- 

 cates Na3Si20.„ CaSioOr,, Al^SicOis. Friedl discusses the composition of 

 staurolite, giving new analyses of some pure varieties, with special refer- 

 ence to the oxidation of the iron. The formula adopted is that of a basic 

 silicate with an oxygen ratio of 2 : 1, viz, (Mg, Fe)^ Alc(A10)i8 (OH)4 

 (Si04)ii. The rare Vesuviau mineral noceriue has been analyzed by 

 Lederer with the result of proving, as shown by Fischer,that it is an 

 oxy-fluoride of calcium and magnesium, with also aluminum, sodium, 

 and potassium, but, perhaps, not as essential constituents. 



Dr. Genth's last paper, entitled Contributions to Mineralogy, contains 

 analyses of a number of interesting minerals, asjoseite. galenobismutite, 

 argeutobismutite (Silberwismuthglanz), cosalite, schirmerite, beegerite, 

 polybasite, vauadinite, annabergite, &c. Koenig has given new analy- 

 ses of cosalite, alaskaite, and beegerite from Colorado. H. F. and H. A. 

 Kellar have published an analysis of a variety of kobellite from Colo- 

 rado, interesting in containing 5 to per cent, of silver, but no antimony. 

 Analyses of several common American minerals are given by E. F. Smith, 

 Knerr, and others in recent numbers of the American Chenjical Journal. 

 Claassen discusses in the same journal some vanadium-bearing magne- 

 tites. Other chemical results are noted in the paragraphs immediately 

 following. 



NEW MINERAL LOCALITIES IN THE UNITED STATES AND ELSEWHERE. 



Perhaps the most interesting discovery of the year is that of the rare 

 mineral, descloizite, in New Mexico, with also iodyrite, vauadinite, and 

 eudljchite, The locality is in Lake Valley, Pouna Auua County, aud 



