Bedford CyrtoUtc. — Luquer. 19 
er, being like that of the Buncombe Co., N. C, zircons. This 
cyrtolite shows no darker core. A mineral resembling cyrtolite 
has also been reported from Branchville, Conn. 
The investigation indicates that the name cyrtolite is ap- 
plicable to the material from this locality, especially as the name 
has already been used for the similar Llano Co., Texas, miner- 
al, and the use of a new name would be quite unwarranted. 
The cyrtolite specimens for examination were kindly fur- 
nished by George L. English & Co. and Mr. L. V. Case, the 
original finder. 
ADDITIONAL MINERALS AT BEDFORD. 
To the list of minerals of the pegmatite veins at Bedford, 
must be added i"^ 
Beryl, of which many crystals of varying size have been 
found, pale bluish-green in color and showing slightly tapering 
hexagonal prismatic forms. 
Uraconite, formerly reported as uranotil, but now proved 
to contain sulphur. 
The former report of the finding of uraninite has been 
proved to be erroneous, the black core of the cyrtolite, with its 
more or less conchoidal fracture, pitch-like lustre and strong 
test for uranium, having been mistaken for pitch-blende. 
Department of Mineralogy, Columbia University, N. Y., 
November 4th, 1903. 
NOTE ON BLOCK MOUNTAINS IN NEW MEXICO. 
By Charles R. Kkyes, Socorro, New Mexico. 
When, at the last meeting of the Geological Socirrty of 
America, the group of papers on the basin-range structure of 
mountains was under discussion, a number of especiallv in- 
structive observations were elicited. Some of these notes have 
since found their way into print. Arising from the discussion 
there have appeared recently t some statements relating to the 
block mountains of New Mexico that seem to require some 
further explanation in order not to have them lead to veiv er- 
• The ".\ugen-gneis«" Area, Pegmatite Veins and Diorite Dike-s at Bedford. 
N. Y., Am. Gbol., vol. xiii, Oct., 1898 
t D. W. Johnson. American Geologist, vol. xx.\i. pp. 1.^5-139, 1903. 
