84 TRANSACTIONS OF THE 
12a By some authorities as Richardson and Peckham, oxygen 
is considered as foreign to natural asphalts. 
A similar article by Henry Wurtz'* gives a descrip- 
tion of gilsonite as well as some solubilities and properties. 
In the first reference to wurtzellite Blake* describes 
it from a physical standpoint, noting its occurrence, hard- 
ness, color, specific gravity, fusibility, electrical properties, 
etc. In giving to it the name “wurtzellite’ he said he 
wished to compliment his friend Dr. Henry Wurtz of New 
York. 
Blake!® explains the difference of wurtzellite from gil- 
sonite and at some length shows that the Utah wurtzellite 
is an entirely distinct mineral from the elaterite of Dana 
and other mineralogists. He takes up its form, fracture, 
toughness, color, luster, elasticity, hardness, specific gravity, 
fusibility, solubility, and electrical characteristics. He 
notes that 4.17 per cent is soluble in ether, the soluble por- 
tion being a yellow oil of unpleasant odor. The removal of 
this oil does not materially affect the properties, however. 
Most of his article deals with the substances that are known 
as elaterite. These he shows are certainly not the same as 
wurtzellite. He also compares gilsonite, albertite, graham- 
ite, and other asphaltums but does not bring out anything 
new about the Utah product. 
Wurtz? gives more comparisons to show that wurtz- 
ellite is a distinct mineral. 
The Utah ozokerite is very similar in properties to 
that of Galicia, but as it contains less oily material and 
is firmer, it is more valuable. Plenty of popular’® accounts 
as to its mode of preparation, uses, etc., are to be found, 
but we could find nothing as to work on its chemical com- 
position, distillation products, etc. 
With the exception of an occasional reference to the 
fact that bituminous sandstones occur in Utah and their 
location, nothing was found about rock asphalt. 
29, Jour. of Industrial and weve Chem. May 19, 1918, p. 3983. 
BE. & M. J. Aug. 10, 1889, p. 11 
4K. & M. J. Dec. 21, 1889, p. 545, 
wy, A. I. M. E. Vol. 18, p. 497. 
7H, & M. J. Vol. 49, p. 106. 
3% The Salt Lake Mining Review, oF 15, 1912; Salt Lake Tribune 
Dec. 29, 1912; U. S. G. S. Bulletin 285, p. 369. 
