The ''■ A I'f/eii'^ -Gnei.ss Arec. — LtujKcr aitif Hies. :>59 
apfp:ni)IX. 
TIIK MIXEKALS OF THE PEGMATITE VEINS AT IJEDFOKl), X. V. 
By Lea McI. Luquer, Ph. D. 
AufAuiite is found in one small vein in P. A. Kinkel's quar- 
ry- It occurs in little, bright, greenish-j^ellow Hakes, between 
the leaves of uiica and the more or less open cleavage of the 
feldspar. One fair sized tabular crystal was found, but un- 
fortunately was too much broken to permit of measurements 
being made. The autunite gave satisfactory tests for Ur. and 
P. 
Ftldspar occurs in quite large rather pure masses, or mixed 
with (juartz. The feldspar in the quarries is principally 
orthoclase, although at times it is largely replaced b}" micro- 
cline. The color and chemical composition have been already 
given in the preceding article on "Augen"-gneiss. 
No crystals, except the rather incomplete "Augen'' of the 
gneiss, have been discovered in this locality. 
Garnet, of the common tetragonal trisoctahedron form 
(211), 2-2, is found more or less plentifull}^ especiall}^ in the 
quarries belonging to L. McDonald and M. Bureusch. The crys- 
tals occur in little veins in the feldspar or sometimes l)etween 
large plates of mica, when they have a tabular habit, being 
flattened parallel to two of the trisoctahedron faces. The 
garnets are usually rather small in size and xarj in color from 
a dark, reddish-brown to a pinkish-red. At times they are a 
good deal decomposed. The dodecahedron form (110). /. was 
noticed on one specimen from Kelt's quarry. 
Meuacra/iif.e. in the tabular form characteristic of the vari- 
ety washingtonite, occurs sparingly^ in the large quartz vein 
in P. H. Kinkel's (juarry, associated with tourmaline and 
([uartz. 
Midi is found in abundance, principally the species musco- 
vite and V)iotite; and occurs in more or less distinct veins or 
coarsely mixed with feldspar and quartz. 
Muscocifa appears in tabular crystals f)r folia' of varying 
size ( sometimes four inclies broad), and tiie smallei- crvstals 
show the hexagonal type of form. The color varies from a pale 
browish-gray to a light greenish-brown. The axial angle is 
large, as shown by the polariscojx". 
