134 Smith—Notes on the Crystal Beds of Topaz Butte. 
Lenticular crystal Prysmatic Calculated, 
from Topaz Butte. crystal. Kokscharow. 
Mt. Antero. 
Px WOE Aull 63° 14’ 63° 247 63° 24/ 
P< Ch LOI A Olly 31° 40’ 31° 307 31° 427 
Pm 7 WOM TPS 20° 47 20° 4” 
ry xo 1011 « 4293 19° 19/ eye alte} 
RS endl eey Ou tae od 27° 437 
Pw SF MOM A AN 29° 597 OX h2 taf 
TP ee MOT Lee SUID DSeeliy fe}? 1133 58° 18/ 
Gh AB OU 2 Oililik 16° 267 162 287 
Za @ O11 A 0291 92257 19° 287 
SS Ge PIB x ND 28° 52/ 28° 21’ 
Ba a NBEO) sy) 15° 487 (Oye IC 
In closing, I wish to express my obligations especially to Mr. 
Whitman Cross, of the U. S. Geological Survey, for the in- 
formation concerning the localities and associations of the 
Colorado phenacites, and to Rev. R. T. Cross, Prof. Geo. J. 
Brush and Mr. C. S. Bement for the material which they have 
placed at my disposal. 
Mineralogical Laboratory, Sheffield Scientific School, Nov. 19th, 1886. 
Notes on the Crystal Beds* of Topaz Butte ; by WALTER B. 
SMITH. 
The “crystal beds,” from which by far the greater number 
of the specimens labeled Prke’s Peak have actually come, are 
situated about 20 mises northwest of that point. This locality 
has been known and worked for about 20 years. Topaz Butte, 
a sharp point five miles due north from Florissant, marks the 
southern limit of the “crystal beds.” It is the highest of a 
chain of similar, bare granitic points extending several miles 
to the north and known as the Crystal Peaks. <A rectangle, 
beginning at Topaz Butte and running six miles north along 
the above ridge, and extending three miles eastward, will 
include most of the pockets from which the beautiful amazon 
stone and smoky quartz crystals have been taken. 
On the west side of the Crystal Peaks, pockets have been 
found scattered over an area equal perhaps to that on the 
eastern slope, but they are fewer by far in number. Phenacite 
and topaz have been found in three of these pockets, while 
neither mineral has been observed on the eastern side, though 
the formation, conditions and associations are apparently 
similar. 
A pocket found in 1884, on a debris-covered slope about one 
and a half miles northwest of Topaz Butte, yielded the first 
phenacites and topazes that were found in this region, which 
have been described by Cross and by W. H. Hidden. The 
* Extract from a paper read Oct. 3, before Colorado Scientific Society, to be 
published in vol. 11, part 2. 
