THE 

 LONDON, EDINBURGH and DUBLIN 



PHILOSOPHICAL MAGAZINE 



AND 



JOURNAL OF SCIENCE. 



[FOURTH SERIES.] 



AUGUST 1861. 



XIII. On the Klaprothine or Lazulite of North Carolina. ByE. 

 J. Chapman, Professor of Mineralogg and Geology in Univer- 

 sity College , Toronto*. 



THE Klaprothine or lazulite is comparatively a rare mineral. 

 It appears to have been first recognized by Widenmann 

 in 1791, in the valley of the Muhr, near Krieglach in Upper Styria. 

 By Werner it was mistaken for felspar ; and, although examined 

 by Klaproth, its true nature was not detected until the analysis 

 by Fuchs of specimens afterwards discovered near Werzen in 

 Salzburg. Brandes then examined the Krieglach specimens, 

 and showed their identity in composition with the examples 

 analysed by Fuchs f. The other known localities of this mineral 

 comprise Vorau near Gratz in Styria (examples from which spot 

 have been analysed by Rammelsberg) ; the foot of the Wechsels 

 near Therenberg in Lower Austria ; Minas Geraes in Brazil ; and 

 Sinclair County in North Carolina. Specimens from this latter 

 locality have been very carefully analysed by Professor J. Lawrence 

 Smith and George J. Brush (now Professor of Metallurgy in Yale 

 College) ; but I have failed to discover in any publication a cry- 

 stallographic or mineralogical description of this North American 

 lazulite. A specimen, however, consisting of numerous small 

 crystals imbedded in fine granular quartz or sandstone, having 

 been kindly presented to me within the few last months, by 



* Communicated by the Author. 



f Brandes appears, however, to have missed the water present in this 

 substance, unless there be a typographical error in his recorded numbers. 

 If we transpose these numbers, as regards the silica (an impurity) and the 

 half per cent, of water said to have been obtained, his analysis will agree 

 closely with those of other chemists. 



Phil. Mag, S. 4. Vol. 22. No. 145. Aug. 1861 . G 



