(2.) That the so-called Leucoxite is no new mineral, but is tita- 

 ite with or without admixture of rutile microliths. 

 (3.) That the so-called titanomorphite is not a new lime tita- 



(4.) That the red brown decomposition products surrounding 

 'ile, not hematite, and were originally enclosed 

 since dissolved. 



New MiKER\iJS.—HeM6rirgite is the name given by O. Luedecke 

 to some minute yellow columnar crystals found in the phonolite 

 of Heldburg, in Coburg, and supposed to be new. The mineral 

 is associated with zircon, and somewr^ resembles that species. 

 It is infusible, transparent, with white streak and adamantine 

 lustre, and of unknown composition. 



Krugite. — This is a new sulphate of calcium, magnesium and 

 potassium found in the Stassfurt rock-salt deposits. It is crystal- 

 line, with a hardness of 3.5, and specific gravity of 2.8. In hot 

 water potassium and magnesium sulphates are dissolved, gypsum 

 remaining; but in cold water the potassium sulphate alone is dis- 

 solved, the double salt K 2 S0 4 , CaS0 4 + H 2 remaining insoluble. 

 It has the following composition: K„S0 4 18.2, MgS0 4 13.5, 

 CaS0 4 63 4, H 2 4.1, NaCl .5— as though a mixture of anhydrite 

 and polyhalite. 



Mineralogical Notes. — The white tourmaline crystals of De 

 Kalb, St. Lawrence county, New York, have been carefully 

 measured by G. Seligman, and are the subject of an exhaustive 

 paper in the last number of Zeitschrift fur Krystallographic und 

 Mincralogic. 



The boracite crystals which occur in the kainite beds at Stass- 

 furt are soft and pliant and under water fall to pieces to form a 

 slimy mass. They have the same composition as the ordinary 

 hard boracite of the carnallite beds. 



By submitting crystals of ncphelite to the action of weak hy- 

 drofluoric acid, certain etch-figures are produced which, accord- 

 mg to a recent paper by Baumhauer, prove that nephelite crystals 

 are always twins. The twins are regarded as the result of trapezo- 

 hedral hemiedry in combination with hemimorphism according 

 to the principal axis. 



The discovery by Mr. VV. E. Hidden, of remarkably fine em- 

 "aids in North Carolina, is of much interest. A well known 

 Philadelphia mineralogist is the fortunate possessor of one of these 

 emeralds, which is a perfect hexagonal prism of deep green color, 

 Wing a length of over ten inches— a size probably unsurpassed 

 b y any emerald in existence. 



The prehnite of Farmington, Conn., has, according to Desclois- 

 ea ux, remarkable optical properties, probably due to the super- 

 Position of numerous lamellae in different positions as regards 

 their crystallographic axes. 



