72 The American Naturatst. [January, 
yttria and thoria minerals associated with less rare compounds in the 
quartz veins cutting granite. Among the bodies new to mineral- 
ogy was found a yellowish substance in large masses with an olive- 
green color on a fresh fracture. Its specific gravity is 4.575, and its 
hardness 5-5.5. It is soluble in hydrochloric acid, decrepitates when 
heated, and breaks into an infusible and insoluble powder. Its com- 
position is: 
SiO, PbO ThO, MnO FeO CaO ALO, Ce,O, Y,O, (LaDi),O, 
$0.47 564 1200 77 290 00 $5 1.50 o 2.94 
UO, Ign. 
:83. -79- 
—— Thorogummite usually occurs in small pieces intimately associated 
with fergusonite and cyrtolite. It has a dull yellowish-brown color, a 
hardness of 4~4.5, and Sp. Gr. of 4.485. Occasionally groups of 
crystals with a ziron-like habit have been found. The mineral be- 
comes of a dull greenish hue after ignition, and is soluble in nitric 
acid. Composition: 
310, UO; TDO ALO, a (Ce¥),0, PbO CaO H,O P,O, Ign 
13: 085 22.43 41.44 965 Og: SEW gry. 88 1. 19 1723 
corresponding to UO, ns (OH),,, or gummite in which the water 
has been replaced by thorite. Metagadolinite is a grayish brown amor- 
phus alteration product of gadolinite from the above mentioned 
locality. It has a red streak, a hardness of 3, and a specific weight 
of 3.494. Mr. Goldsmith?’ has made an SORS analysis of it, 
` and regards it as a new mineral.” His result is 
S10, Yai?) 40.2) Fe,0, CaO MgO BHO 
18.145 21.854 0,062 26.0260 3.642 2:14 Q. 761 
—— Daviesite.—Associated with other decomposition products of lead 
ores at Minas Beatriz, Sierra Gordo, Chili, Mr. Fletcher ™ discovered 
tiny, colorless, prismatic crystals of an orthorhombic mineral, with an 
axial ratio 1.2594: 1 : .6018, and the plane of its optical axes parallel 
to 2» Peo. From the few chemical tests made upon the small amount 
of material at his command, Fletcher supposes the mineral to be an 
oxychloride of lead.——Dudgeonite * was found at the Pibble Mine, 
near Creetown, Scotland, in little cavities occurring in mickeline. It is 
a grayish-white earthy substance, with a slightly resinous lustre. Its 
9 Proc. Acad. Nat. Sci, Phila, Pt. IL., 1889, p. 164. 
Cf F. A. Genth. Amer. Jour. Sci., Sept. 1889., pp. 198-200. 
U Miner. Mag., VIII., May, 1889, p. 171. 
13 Heddle: Miner. Mag., May, 1889, p. 200. 


