864 ON THE KLAPROTHINE OR LAZULITE OF NORTH CAROLINA. 
afterwards discovered near Werzen, in Salzburg. Brandes then re- 
examined the Krieglach specimens, and shewed their identity in 
composition with the examples analysed by Fuchs.* 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 
crystallographic 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 Prof. T. Sterry Hunt, 
of the Geological Survey of Canada, I propose, in the present place, 
to offer a brief notice of its leading mineralogical characters. 
All the earlier determinations of Lazulite crystals referred the mineral 
to the Trimetric or Rhombic System. Priifer of Vienna was the first 
to maintain its Monoclinic character, and the angles given in the more 
recent works on Mineralogy are adopted from his measurements. 
The European crystals present in general a somewhat complicated 
aspect, although certain combinations closely resemble those of the 
Trimetric System. Two “augite pairs,’ are always present. These, 
according to Priifer, measure respectively over a front edge 100° 20’ 
and 99° 40', the difference being but little more than half-a-degree. 
According to the same observer, moreover, the inclination of the base 
on the prism-plane (0 P: co P, in the notation of Naumann+) only 
differs from a right angle by 23 minutes. Were these values, conse- 
quently, all that we had to depend upon, it would be manifestly 
unsafe to rely upon them as proofs of the monoclinic crystallization 
of Lazulite. But in some combinations, the forms below the middle 
zone of the crystal are less numerous than those above this zone, 
or otherwise differ from the latter in their measurements. Never- 
theless, in certain Trimetric minerals, and notably in Datolite and 
Wolfram, we have the same peculiarity, and we might therefore look 
* 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. 
+ =O: Lin Dana’s notation; and B: V in that of the writer. 
