464 Scientific Intelligence. 



in violet-colored scales in the serpentine of Dundas, Tasmania. 

 Analysis led to the formula, 2MgC0 3 .5Mg (OH) 2 .2Cr(OH) 3 .4H 2 0. 

 — Centralblatt Min., p. 569, 1912. 



Arduinite from the Val dei Zuccanti in Venice, now named 

 by E. Billows, is a zeolite earlier referred to a red natrolite and 

 to stilbite. Analysis by Billows gave : Si0 2 49*40, A1 2 3 14*57, 

 CaO 6-57, Na 2 11-77, Kfi 1'54, Fe 2 3 and Mn 2 3 2-43 = H 2 

 13-85 = 100-13. For this the formula H 1? Na 4 CaAl Q Si 8 O 30 is cal- 

 culated. — Rivista Min. Crist. Jtal., vol. xli, 1912. 



Palaite, Stewartite, Salmonsite, Sicklerite are new man- 

 ganesian phosphates briefly described by W. T. Schaller from the 

 tourmaline locality near Pala in Southern California, the first 

 three from the Stewart mine, the fourth from the Vanderburg- 

 Naylor mine. Palaite is a flesh-colored crystalline mineral (mono- 

 clinic ?) resulting from the alteration of lithiophilite ; formula 

 5Mn0.2P 2 5 .4H 2 0. Stewartite has a similar origin, is probably 

 triclinic and while the material did not admit of the determina- 

 tion of its composition, the form and optical properties show it to 

 be new. Salmonsite is derived from hureaulite and has the com- 

 position Fe 2 3 .9Mn0.4P 2 5 .14H 2 0. Sicklerite occurs in brown 

 cleavable masses derived from lithiophilite; formula Fe 2 3 .6MnO. 

 4P 2 5 .3(Li,H) 2 0.— Journ. Wash. Acad. aSW., March 19, 1912. A 

 full description follows later in a Geol. Survey Prof. Paper on 

 " The Gem Tourmaline Field of Southern California." 



Arsenoeerrite is iron disulphide, FeAs 2 , in octahedral crystals 

 with the pyritohedron, (310), and hence allied to pyrite. It is 

 described by H. Baumhauer from the Lercheltiny Alp in the 

 Binnenthal, Switzerland. An analysis by Schneider gave : 

 As 71-10, Fe 2b -90 = 100.— Zs. Kryst., li, 143, 1912. 



Hokutolite is a radio-active mineral described by Y. Okamoto ; 

 it occurs as a crystalline incrustation in the hot waters of the 

 creek of Hokuto in Taiwan, Formosa. It consists chiefly of the 

 sulphates of lead and of barium in varying proportions but 

 whether as an isomorphous mixture or as layers of the different 

 compounds is not certain. The mineral varies in color from 

 white to yellow and brown ; the specific gravity was found to be 

 6*1. — Minerals of Taiwan, p. 22, 1912. 



10. Text Book of Petrology ; The Sedimentary Hocks ; by F. 

 H. Hatch and R. H. Rastall. 12mo, pp. 425 ; 60 figures. 

 London, 1913 (George Allen and Co.). — This work is intended as 

 a companion volume to that on igneous rocks published in 1909 

 by Dr. Hatch, though by a different publisher. This fact and 

 the nature of the work make the title somewhat misleading, since 

 the sedimentary rocks themselves are not classified and described. 

 The book is, in fact, devoted to a discussion of the processes by 

 which sedimentary rocks and their metamorphic derivatives have 

 been formed, and is thus rather a work on their petrogenesis than 

 on their systematic petrology. This may be seen from a con- 

 sideration of the table of contents, in which successive chapters 

 treat of : deposition in general ; fragmental, chemical, and organic 



