318 Scientific Intelligence. 



work done upon the mineralogy of Pennsylvania during the year 

 1875. It contains a considerable number of new analyses, mostly 

 of minerals, also of rocks, mineral waters and natural gases. 

 Among other points Dr. Genth shows that the "me&ano 



of ( ooke is - not a lv<>,1 s;mv'h^ ], u t simply an impure variety of 

 hydrated iron sesquh > 



from Blue Hill, Delaware Co., described by Lea as a variety of 

 orthoclase, is shown to contain 3*7 p. c. baryta ; the mean of three 

 analyses gave: Silica r.2 •;■'. alumina lienT. iron m-< piioxide 0'12, 

 ■<>_', lime u-l<t, strontia, tr., baryta 3*71, soda 4'43, pot- 

 ash 9-00, ignition 0-19=100'23. Specific gravity 2-692. e. s. d. 



11. Brief Notices of some newly <l,*-nh>>l „>;,',< .;,!.<. I.,nlhi, „it-. 

 —Occurs in small mon a distinct basal cleav- 



age. Hardness 3-4. Specific gravity 3-12. Color eh 



ent. Its composition is expressed by the formula 2Fe 3 Pg 

 Fe0 2 -j-8aq, which requires: Phosphorus pentoxide i".f>s. 

 iron pr..t-.\i.k' r,:>.-in>. water 17-06=100. The formula of vivianite, 

 to which it is related, is Fe 3 P 2 8 +8aq. Ludlamir. .,. ,-ur- h; - »" 

 of the mines of Cornwall, England, associated with vivianite, 

 siderife. pyrite, ar>enopvrit.c, etc. — {Firhf, Phil. M";/.. Jan.. b^77.> 



St,>eitffik.—()w\\Y* usually in splierical incrustations with a 

 radiated structure, mid a drusy surface; also rarely in "rtho- 

 rhombic ery-' n. Hardness 3-4. Specific grawty 



• white, in some varieties bright carmine-red, in «i> > - 





tals also colorless. Transparent to translucent. Composition 

 expressed by the formula FeP 2 0g+4aq, which requires: Phos- 

 phorus pentoxide ;7".i7. iron s.-^.j i"io\ido *2'7s, water |it-j.".= l" '• 

 In form and composition it is allied to scorodite (FeAs 2 8 +4aq). 

 Strengite is found with cacoxenite at the iron mine Eleonore ue«i 

 Giessen.— (Nies, Jahrb. Min., 1877, 8.) 



/v/,,,,/;v._Tlie name {»ht : /ite is given provisionally by Prof. 

 A. it. Church to th> ■ "manganese nod- 



ules" obtained by the Challenger in deep-sea soundings in the 

 Pacific. An analysis afforded the following results : Manganese 

 dioxide :;. -j-_>, i,.,,., ....,,„;,, vide 20-02, alumina 3 30, silica i«'-... . 

 chlr.rin.- o-;i. M u -, < -,. V :l , , t< -., (.--::. uat. r !o>t 1 eh.w 100° 24'55, 

 lost at a red heat 10-00=100. It will be seen that the nodules, 

 if homogeneous, have a complex chemical composition, and by B* 

 means consist essentially of" nearly pure peroxide of manganese, 

 as had been reported. As stated by Prof. Church, r 

 analysis ■ ,. !t -,.,U-.| h.-f.-iv the name y «/'/</''« 



can be fairly accepted.—! ' 'hureh. Mi,>t>.r<ih><ii<'<d Magazine, No. 2, 

 p. 50, Nov., 1876.) 



Zaicrencite.—M. Dauhr.'e has given the name lawrencite to the 



protochloride of iron, the presence of which he has detected in 



the Greenland meteoric iron. It was earlier separated by Dr. J- 



- nth from th ■ T.-nn. -. .- m. te tC iron and the name 



is given in honor of him.— (C. £., Jan., 1877;) 



H>"-- "•■'..-'..— G. Grattarola of Florence has observed a 

 white mealy material surrounding the castorite of Elba, and ne 



