154 GEOLOGICAL SUEVEY OF THE TEERITORIES. 



■water, it must, in a chemical system, be referred to that species ; but, taliiug into con- 

 sideration the sjiecific gravity, the small perceutage of water, and the circnmstaucea 

 under which the mineral is formed, I wish to distinguish it as a well-defined sulj-spe- 

 cies of opal, and propose to name it " Fealite" as you were the first to find and col- 

 lect the mineral. 



Very resjDectfully, 



FREDERIC M. ENDLICH. 

 Dr. A. C. Peale. 



The following are analyses by Dr. Eudlicli of specimens from the same 

 locality. The first is from the top of one of the cones, and is a typical 

 specimen of geyserite. It is one of the latest formed and is covered with 

 beautiful bead like processes, having a pearly luster. The second 

 specimen is also from the Giant Geyser, but is from one of the lower 

 layers and is much older. It is opaloid and in layers some of which 

 are white and others red. The latter have a flesh-color, like raw-beef. 



Analysis of specimen Wo. 1. 



Per cent. 



Loss on ignition 13. 42 



Silica 79.56 



Lime 1. .54 



Alumina 046 



Magnesia 1.78 



Iron Trace. 



Chlorine Trace. 



Soda* Trace. 



Total 97.76 



Analysis of specimen No. 2. 



Per cent. 



Loss by ignition 6.25 



Silica 92,64 



Lime 1.03 



Ferric oxide 0. 60 



Alumina Trace. 



Magnesia Trace. 



Soda*" Trace. 



Strontia* Trace. 



Total 100.52 



Fig. 39 is an illustration of one of the minor geysers of the Ujiper 

 Basin. 



The Grotto Geyser is 400 feet northwest from the Giant, and separated 

 from it by a line of trees. There are two cones which spout alter- 

 nately during the eruption. The larger one, which we will call No. 1, is 

 very irregular and is 8 feet in height. The tube from which the water 

 is projected measures G feet by 2 feet and is 19 feet deep. I'he other 

 cone, Ko. 2, is 19 feet in diameter at the base and 14 on top. It is 4 

 feet high, anil the orifice on top is quadrangular in shape, measuring 

 5 feet by 3 feet. When not in action the water is from 10 to 15 feet 

 below the top. The basin is 10 leet deep. The entire length, including 

 both cones, is 53 feet and width 20 feet, the centers of the two being 

 30 feet apart. The plan shown in Fig. 40 gives the relation of the two. 

 Between them there are two small geyser-tubes which spout whenever 

 the main cones are in action. The eruptions consist of a series of jets 

 averaging about 20 per minute. 



* Spectroscopic examination. 



