1046 The American Naturalist. | December, 
Wellsite, a new Zeolite.—Pratt and Foote® describe a new 
mineral found in the Buck Creek Corundum Mine, Clay Co., N. C. 
They name it wellsite in honor of H. L. Wells, Prof. of Chemistry in 
Sheffield Scientific School. It occurs together with chabazite on albite, 
rarely also on hornblende and corundum, these minerals constituting a 
vein in a large mass of dunite near its contact with gneiss. Wellsite 
is monoclinic, forming doubly-twinned crystals like those of harmotome 
with pseudotetragonal aspect. Twinning planes are c, 001 and e, 011. 
Forms observed c, 001; a, 001; b, 010; m,110; a: b : c=0.768 : 1: 
1.245 B=23° 27’. Cleavage none, lustre vitreous, colorless or white, 
hardness 4-4.5, specific gravity varying between 2.278 and 2.366 prob- 
ably depending on differences in the ratio of barium to calcium in 
different crystals. Double refraction positive and weak. Plane of 
optic axes at right angles to 010, the obtuse bisectrix inclined 52° toc 
in the obtuse angle. 2 E probably between 120° and 130°. Chemical 
composition : 
SiO, AlO, BaO SrO CaO MgO K,O NaO H,O Sum 
43.86 24.96 5.07 115 580 062 340 1.80 13.35 100.01 
corresponding to the formula R AI,Si,O,,.3H,O. R contains BaO: 
CaO: (Na,O+K,O) in the ratio of 1:3:2. It was found that the 
Water appeared to be in three conditions in the molecule, one- 
third being given off between 100° and 200°, another third between 
200° and 300°, and the remaining third only at a red heat. The rela- 
tions of wellsite to the phillipsite group of the zeolites is shown in the 
following table : 
& D 0 B 
Wellsite. . . . RAI,Si,O,,.3 HO. 0.768 ;:1: 1.245 53 27 
Phillipsite. . . RA1,Si,O,,.44 H,O 0°70949:1:1.2563 55 37 
Harmotome . . RA1,Si,0,,.5H,O  0.70315:1:1.2310 55 10 
Stilbite . . . -RA1,Si,O,.6H,O 0.76227:1:1940 50 49 
The authors predict the probable occurrence of a fifth member of the 
group corresponding to a hydrated anorthite which would have the 
composition RA1,8i,O, ‘2 H,O. 
Silicate containing lead.—Penfield and Foote? describe a new 
mineral from the Franklin, New Jersey, zine deposits to which they 
give the name roeblingite in honor of Mr. W. A. Roebling, the distin- 
guished engineer of Trenton, N. J. Roeblingite occurs at the one thou- 
5 Am. J. Sci., Vol. CLIII, 1897, p. 443. 
€ Am. J. Sci., Vol. CLIII, 1897, p. 413. 
