Description of a new Mitieral iSpecies. 161 



those of the Swanson ravine and Vermilionville, may be employ- 

 ed with great advantage, 



Ah-eady 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. XIII. — Calstronbarite, a new Mineral Species ; by Charles 

 Upham Shepard, M. D., Professor of Chemistry in the Medical 

 College of the State of South Carolina. 



The mineral here described was received several years since 

 from Messrs. Gebhard & 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. 



Massive, 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 reddish brown. 



Streak white. Translucent. 



Brittle. Hardness =3.25. Sp. gr.=4.20 to 4.22. 



* Vol. XXVII. p. 363. 



Vol. XXXIV.— No. 1. 21 



