244 Miscellaneous Notices in Mineralogy^ (zeology, SfC. 



tain on the east side, twenty five miles south west of Win- 

 chester, and it appears to be confined to a small spot of 

 ground not exceeding twenty or thirty yards square." Al- 

 though this fluor spar is spoken of as occurring in loose pie- 

 ces, it evidently cannot be far from its native bed, which 

 must be in the lime-stone of the contiguous mountain. 



Among the specimens sent to us, the violet fluor is, in 

 some instances inlaid like mosaic, in large, white, and bril- 

 liant fragments of rhomboidal calcareous spar; the con- 

 trast produced by the violet fluorin its white bed is beautiful. 



This fluor spar is highly phosphorescent when thrown on 

 red hot iron in the dark. 



We do not observe any crystals among our specimens, al- 

 though the cleavage and fracture shew the usual crystaline 

 structure. 



In exposing some pieces, recently to phosphorescence, we 

 observed the fragments thrown around by decrepitation were 

 frequently very distinct tetrahedra, thus giving us, spontane- 

 ously-, the integrant molecule ordinarily obtained by dissec- 

 tion. 



P. S. Since writing the above, we have learned the fol- 

 lowing additional particulars from Mr. D. W. Barton. 



The fluor spar may be said to be at the foot of the north 

 mountain, as the ascent is not perceptible until you arrive 

 at this spot. It is found on a small ridge of yellow clayey 

 soil, deposited in the space intervening between two walls 

 of lime stone, which is the common rock in the country ; 

 indeed within this vein (which is probably twenty or thirty 

 feet wide) the crystalized carbonat of Ume alternates with 

 the fluor spar. 



The direction of the vein is parallel with the range of the 

 mountain, i. e. nearly north and south. The land has once 

 been cultivated, and the fluor spar near the surface has been 

 broken by the plough and dispersed over a space of forty or 

 fifty yards in extent. The locality has never been diligently 

 explored, and it is therefore not ascertained whether the 

 mineral exists in masses of considerable magnitude. How- 

 ever, all the researches that have Wtherto been made indi- 

 cate that it does. 



Illinois fluor. — In Vol. I. p. 52, of this Journal the fluor 

 found near Shawnee Town (Illinois,) is mentioned. We 



