PSEUDO-SERPENTINE FROM STEVENS COUNTY, WASHINGTON. 
By F. \Y. Clarke 
In the course of an investigation upon the ornamental stones of 
ravens Count}', Wash., Mr. R. W. Thatcher and Trot'. Elton Fulmer, 
f the State Agricultural Experiment Station, examined a supposed 
grpentine which proved to have quite anomalous composition. To 
be unaided eye the rock was ordinary serpentine oi' a typical yellowish 
pen color; it was fairly homogeneous, and capable of receiving a line 
olish. Incomplete analyses, however, by both o\' the above-named 
feemists showed that it was not serpentine, and as I had been consulted 
itli regard to the interpretation of the data, a sample was sent to me 
>r more exhaustive study. 
Accordinc;- to Prof. S. Shedd o{ the Washington Agricultural Col- 
ge, who is conducting the investigation, the rock is from the quarry 
the United States Marble Company. L2 miles north and west from 
ftlley, a station on the Spokane Falls and Northern Railroad. It 
itcrops on the face i)( a high bluff at an elevation oi about d,o70 feet 
ove sea level, and forms a wedge-shaped mass cutting across the 
untains in a direction 5 west oi north. The adjacent rocks are 
ktes, which lie conformably upon a very coarsely crystalline, dark, 
nost black, magnesian carbonate. The "serpentine" 1 itself varies a 
od deal in color, and a series o( samples in the United States 
tional Museum show that the output o( the locality is far from 
iforin. They range from a white carbonate, through various inter- 
diate mixtures of the verde antique type, to material which appears 
he ordinary serpentine. The latter, however, as shown by the 
pentine under consideration. is distinctly laminated in structure, 
|1 exhibits a splintery fracture. An analysis by Mr. George Steiger 
e the following results: 
SiO, 13. 08 
A I .< >.. 1 . 63 
l-\ ! 2 ( > 3 L. 25 
FeO 19 
Mg< ) 56. H 
( !a< ) 33 
H 2 Oa1 100 85 
H 2 above 100 23. 94 
C0 2 2. 03 
99. 74 
