50 Reétramination of American Minerals. 
sults of analysis on specimens carefully selected to avoid the 
quartz, gave 
‘he 2. 
Silica, . . ‘ 37-20 ; . : 87-03 
Alumina, . % 59-02 61-90 
Peroxyd of iron, . : ; ; ; wy 
Ignition : 1-03 : : ; 85 
99:33 
These correspond to the formula 41° Sit. 
23. Ozarkite, an amorphous Thomsonite. 
This mineral was described by Professor Shepard as a new 
Sspecies.* Jt occurs in irregular veins and masses in Elolite at 
Magnet Cove, Arkansas. 
We are indebted to Mr. Markoe of Washington, for a large 
quantity of the Elzolite from which we were able to obtain the 
mineral in a pure state. Its color is white, structure granular to 
compact. Hardness 5; Sp. Gr. 2°24 (Shepard). Gelatinizes with 
hydrochloric acid. 
T'wo analyses gave, 
tik 2, 
Silica, . 2 - 36°85 A : : 37-08 
Alumina, . ¢ = 29°42 
Peroxyd ofiron, . ‘ 155 t 3113 
Lime, t 13-95 13-97 
Soda, 39 372 
Water, 13°80 13°80 
massive variety of that specie 
e analyses give the formula & $i+3& Sit7t=Silica 378, 
alumina 31:5, lime 13-00, soda 4-80, water 12-90, 
cial examination was made for phosphoric acid, but in the 
This is the composition of Thomsonite, and the mineral is a 
S. 
24. Dysyntribite, a rock of indefinile composition. 
The substance to which the above name was given by Prof. 
Shepard,§ occurs in large masses in the Northern part of th 
State of New York. It is of a green color, sometimes mottled 
* Am. Jour. Science, [2] ii, : Tol te ee, 
{ Jour. Bost. Soc. Ni A Hist., 1849, p. 42. t This Journal, [2] * 430, 
§ Rep. Amer. Assoc, Advan, Sei, vol. iv, 311, iid fee 
