216 
DESCRIPTIVE MINERALOGY. 
LOCALITIES. 
Albany County. In the town of Bethlehem, calcareous 
spar, associated with crystallized quartz, occurs in the seams 
of greywacke on the banks of the Norman’s kill, two miles 
south of Albany. The crystals are the equiaxe of Haiiy, with 
the edges usually rounded, giving them a form somewhat len¬ 
ticular, a name by which they are often known. Figure 58, 
g on g 134° 26>'. 
In a cavern about twelve miles south of Albany, large masses 
are found of a white and brownish colour, which, although they do not exhibit regular crys¬ 
talline forms, are easily cleavable into rhombohedrons. Other varieties of carbonate of lime 
are found in this cavern, as stalactites, stalagmites, etc. 
In the same town there occur, in the water limestone, cavities which are studded with 
small rhombohedral crystals of calcareous spar. The angles of the crystals are usually 
rounded as if by fusion, similar to those found in the county of Schoharie, to be hereafter 
described. There are also dodecahedrons, and dodecahedrons terminated by three rhomboidal 
faces ; but these crystals are quite small. 
In the town of Knox, twelve miles northeast of Schoharie court-house, there is a cavern 
about five hundred feet in length, a ground plan of which is given in the annexed cut (Fig. 59). 
Fig. 59. 
Fig. 58. 
