138 
Transactions Texas Academy of Science. 
Hidden, William Earl, and’ Mackintosh, J. B. 
Oxygen ratio. 
Si O, 
.. 13.085 
43.62 = 2.000 
UO 3 .... 
.. 22.43 
23.37 = 1.071 
Th O 2 
... 41.44 
31 22' 
Al, O 3 
... 0.965 
2.83 i 
Fes O 3 
... 0.845 
1.59' 
(Ge Y )2 O 3 , etc..., 
... 6.69 Atomic weight =135. 
6.30 i 
) 43.64 = 2.001 
Pb 0 
... 2.16 
0.97 1 
Ca 0 
... 0.41 
0.73, 
Hs 0 
... 7.88 
43.78 = 2.008 
P 3 O 5 
... 1.19 
Moisture 
... 1.23 
98.325 
* 
* * * 
* ■ * 
* 
* 
“We name this mineral thoro-gummite because it is a gummite in which 
the water has been replaced hy the thorite molecule. 
“Nivenite, a hydrated Thorium-yttrium-lead Uranate: 
“This mineral we found intimately associated with fergusonite and thoro- 
gummit. It is as yet a rare mineral at the locality. Its specific gravity 
is 8.01, II.=:5.5. It is velvet-black in color, and iwhen powdered becomes 
brown-black. After ignition it turns blue-black. As yet only massive 
pieces have been found, but some of these suggest that the species may be 
isometric in crystallization. It is easily soluble in nitric and sulphuric 
acid, and some slight effervescence was noticed upon dissolving the min- 
eral. The analysis 
gave the following results : 
Oxygen Ratio. 
UO 3 
... 46.75 
48.69=12. 
IT Os 
... 19.89 
14.62 > 
i 
Th Os 
... 7.57 
5.74 
1 
Ys O 3 etc 
... 11.22 Atomic weight 124.2 
11.34 
>- 37.33= 9.20 
Fes O 3 
... 0.58 
1.08 1 
1 
Pb 0 
... 10.16 
4.55 ^ 
1 
(Ignition) loss Hs 
Insoluble 
0 2.54 
... 1.22 
99.93 
14.11= 3.48 
******* 
Analyses of Cleveite and ,Brbggerite. Fergusonite: 
“This heretofore rare mineral occurs in large quantity at this new local- 
ity. 'Up to this date we have received over seventy kilos, some masses of 
which weighed over a pound. Broken prisms, rough in form, rarely show- 
ing terminal planes and masses of crystals interlacing each other is the 
manner of occurrence. The immediately assoeiaited minerals are cyrtolite 
and thoro-gummite, and also magnetite. The gadolinite also sometimes 
encloses it. It also occurs alone in a matrix of orthoclase or of quartz. 
'One large mass of this kind of gangue, upon being broken up, yielded over 
thirty kilos of pure mineral in the form of fragments, most of which were 
basal sections of crystals which had been originally four to eight inches 
long and aibout one and a half c. m. thick. 
“We have found two distinct varieties, of which we here append analyses 
and description. 
