<r emer 
Description of a new Mineral Species. 161 
those of the Swanson ravine and Vermilionville, may be employ- 
ed with great advantage. 
Already an active and intelligent class of emigrants is finding its 
way into this most inviting region, and is beginning to reap its 
advantages. A population of several hundred is scattered over 
the prairie lying a few miles to the north of Rockwell, where 
but a few years ago the white man was almost a total stranger. 
Nor can it be doubted, that as soon as the Michigan and Illinois 
canal is completed, a fresh impulse will be given to the country, 
and a speedy development of the resources we have pointed out, 
ensue. 
Art. XIL.—Calstronbarite, a new Mineral Species ; by Cuarves 
Upuam Sueparp, M. D., Professor of Chemistry in the Medical 
College of the State of South Carolina. 
Tue mineral here described was received several years since 
from Messrs. GesHarp & Bonny, of Schoharie, (N. Y.) along 
with specimens of Strontianite, which were noticed by me at that 
time in an article published in this Journal.* I then regarded 
the subject of the present notice as heavy spar. Having had oc- 
casion however, within a few days, to re-examine these minerals, 
and meeting with more distinctly crystallized fragments than any 
hitherto observed, I discover the supposed heavy spar to be a new 
species, and one moreover which offers in its chemical constitu- 
tion a very remarkable exception to any saline compound as yet 
known to exist in the mineral kingdom. 
Mineralogical Description. 
ive, in broad, straight, lamellar masses. Primary form, 
right rhombic prism. M on M=102° 30’ to 103°. 
Cleavage, M on T perfect ; the latter more easily obtained than 
the former. 
Lustre, vitreous to resinous. Color white, inclining to gray, 
rarely exhibiting a tinge of ruidieb brown. 
Streak white. Translucen' 
Brittle. Hardness=3.25. "Sp. gr.=4.20 to 4.22. 
* Vol. xxvii. p. 363. 
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Vou. XXXIV.—No. 1. 
