216 



DESCRIPTIVE MINERALOGY. 



Fig. 58. 



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 ong 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. 



