LIME. 
219 
passes into the white, opaque or transparent ones. The exterior of these crystals is always 
more or less rough, but they are often translucent throughout, in which case the peculiar 
tint can be distinctly seen. They are some¬ 
times a foot or more in length, and some have 
been found weighing nearly one hundred 
pounds. A striking peculiarity of many of 
the crystals is, that three sides of the rhom- 
bohedron are perfect, while the others are 
drawn out into the form of the hog-tooth spar, 
the summit having a kind of cap of a different 
colour from the body of the crystal, and 
having the appearance of a subsequent de¬ 
posit. They are indeed sections of dodeca¬ 
hedrons built upon the primitive rhombohe- 
dron, but which either the position of the 
crystal, or some other cause, has prevented the completion of, on the opposite side. I have 
endeavored to represent them in Figures 66 and 67. P on r 151° 3k 
Four miles south of Oxbow, in the town of Antwerp, and on the road to that village, an 
excavation for lead ore as usual opened a fine vein of calcareous spar. Large masses and 
imperfect crystals were found, from which beautiful cleavage crystals have been obtained. 
They are white, purple and brownish, as at the preceding locality. They usually have a 
lustre which is more highly vitreous than it is in any specimens of this kind which I have 
seen. 
Fig. GC. 
Fig. G7. 
Fig. 68. 
Fig. 69. 
At this locality, there have also been found crys¬ 
tals in the form of six-sided prisms, prismatique of 
Haiiy (Fig. 68); and in that of the scalene dodeca¬ 
hedron terminated by three rhomboidal faces, hinaire 
of Haiiy (Fig. 69). c on o 90° 0 / ; c on c 120° 0 / . 
P on r 151° 3 / ; r on r 144° 20' 26"; r on r' 104° 
28' 40" ; r on r" 133° 26k 
On the east bank of Yrooman lake, a mile north¬ 
west of the village of Oxbow, calcareous spar is 
found in abundance in veins in the primary rock, 
associated with crystallized quartz. The forms are 
the hinaire of Haiiy (Fig. 69), and the rhombohe- 
dron with two or more of the edges replaced by new 
planes. Numerous crystals are usually grouped together, in such a manner as to exhibit a 
very complicated arrangement. This is a locality well worthy the notice of the nnneialogist. 
