252 New Minerals from Arkansas. 
Secondary form. Hexagonal prism, with lateral wie trunea- 
ted by narrow and. brilliant planes. 
Cleavage indistinct. Fracture conchoidal. ‘Surface of. the 
broader planes rather dull, of the narrow ones smooth and brilliant. 
Lustre vitreous. Color black. Streak grayish black, with a 
tinge of lavender-blue. Tarnished with blue and pavonine tints, 
thus causing it to resemble specular iron, (for which substance it 
had been mistaken.) It also strikingly resembles some varieties 
of bluish black, massive, or imperfectly crystallized, tourmaline. 
Hasdnga: 7-67. 5. Specific gravity =3°862. 
- Heated in a glass tube, it emits a little moisture, and glows 
with redness, immediately as the tube on which the fragment 
rests, becomes red. Its powder loses’3 p. c. on being ignited, 
Alone on charcoal, it fuses readily (and with scarcely any. percep- 
tible effervescence, into a shining obsidian-like globule, which is 
not affected by the magnet. With — it trent a ‘transparent 
glass, slightly tinged green by iron. pail 
“Tt is easily decomposed by the oie giant silica being 
separated. It consists essentially of silicic acid, yttria, thorina,(?) 
oxide of iron and water. I could not — in it, either oxide of 
cerium or lantanum. 
It approaches in some of its properties the species allanite ‘a 
gadolinite ; from both of —— it is semapeiccag distinct bowen 
to entitle it to a specific 
The specimen affording is ste sme with that last selatved to, 
as embracing the ozarkite. The crystals are very minute ; but 
a large mass of the mineral occurs in eleolite, more than two 
inches i in diameter, and which appears to belong to a single in- 
dividual, which (like the indicolite crystals of Goshen) has been 
much interpenetrated by the gangue, so as on the whole to have 
less perhaps than one-half of the outline of the crystal occupied by 
the pure mineral. Fragments of pure schorlomite an inch in 
seer: however, may be detached from ee saw artic oh 
nih Benn called a eompaet. feldspar, is a Beatie well <Rensatininal varie- 
ty; is perfectly fresh and unaltered, forming a red, oily, translucent 
mineral. Its sp. gr-=2-60. H.<6-0. It is fusible into a colorless glass, and in 
are teof a itetins at once forms with warm nitric acid, a flesh-colored jelly. 
same rock contains ten gan coca Be oes and schorlomite portions 
