J. P. Kimball—Grahamite in the Huasteca, Mexico. 285 
—in fissu rstic the roc as pr 
duced grahamite, albertite and other less hydrogenous hydro- 
carbons of the same ty 
*tructure, conchoidal in fracture, and of a resinous and brilliant 
luster, the Ritchie and Cristo varieties, which are very similar, 
he rather granular consistency. They possess a very distinct 
roa a jointed, structure, as well as columnar partings 10 the 
* W. P. Jenny, Am. Chem., v, p. 10. 
