Record of Geology of Texas, 1887-1896. 
119 
Goldsmith, B. 
affords no streak on unglazed porcelain, and it is brittle; the powder is 
grayish green. 
‘Toir analysis the " substance was selected with care, and was easily 
decomposed by hydrochloric acid, the silica gelatinizing. 
“Tlie result was as follows: 
Silica 25.70 per cent. 0=13.7 
Ittria 58.30 per cent. 0=12. 
Iron monoxide 15.52 per cent. 0= 3.44 
Glucina 2.10 per cent. 0= 1.32 
•!:- ^5- * , * * ■» -St- 
‘‘The material enveloping the Gadolinite seems to be amorphous; dull, 
with an uneven 'fracture and brittle; its color is gnayish brown; streak 
red, when powdered bright red. 
“It was found necessary to float off the suspended part in water from 
another portion which was not decomposable by hydroehlorie acid, and this 
was repeated until a sample was wholly decomposable by that acid. The 
silica did not gelatinize. 
“IIardness=3. Gp. gr.=3.494. 
“Not fusible before the blow-ipipe. The fluxes indicated iron; heated in 
a tube it gave water. Heated with carb. soda upon charcoal it afforded a 
'dark-brown slag. 
“The analysis indicated great complexity of mixture: 
iSiiOa 18.145 per cent. 0= 9.676 
Ceg 'O 4 20.662 per cent. 0=16.773 
Fcs O 3 26.026 per cent. 0= 7.807 
Y O 21.854 per cent., 0= 4.500 
Ca O 3. '642 per cent. 0= 1.040 
Mg 0 0.214 per cent. 0= 0.085 
H 0 9.761 per cent. .0= 8.676 
■5:- 4 :- * -:{• * * 
“I am not aware that this material over the Gadolinite has been named. 
I propose for it the name Metagadolinite.” 
175. Gregg, A. 
Economic Minerals of San Saba County. 
Texas Geol. and Man. Surv., First Rept. of Progress, 1888, pp. 
74-76. Austin, 1889. 
Economic Minerals of San Saba County. 'Marbles: iColor and Varie- 
ties; 'Specimens furnished the U. S. National 'Museum. Great Springs: 
Artesian in -Character; Valuable for Power and Irrigation; Occurrence 
along the Paleozoic Outcrop in the southern part of the County. (Sand- 
stone for Building Purposes abundant; of a “rich warm yellow” color; 
^ Colorado River cuts through an extensive deposit; some strata 12 feet 
thick. Grindstone 'Grit 'near the mouth of the 'San Saba, and at several 
points on the Colorado. Blue Limestone occurs near the town of San 
Saba. “Fire-iproof” rock is abundant, underlying the Blue Limestone. 
White Limestone occurs between the San Saba river and the Paleozoic Out- 
crop. Paleozoic Rocks, Granjtp, Granite Sa^ndstone, Quartz Schist, etc., 
