242 



DESCRIPTIVE MINERALOGY. 



Fig. 110. 



Fig. 111. 



Putnam County. Minute crystals of apatite, having a bluish green colour, are found asso- 

 ciated with pyroxene in Philipstown. They are, however, scarcely worth collecting as cabinet 

 specimens. 



St. Lawrence County. Specimens have here been found of a size entirely unknown 

 before. At Robinson's farm, in the town of Hammond, a crystal has been found nearly a foot 

 in length, and weighing eighteen pounds ! This, however, is not entirely perfect ; but perfect 



crystals of a smaller size are abundant. 

 They are six-sided prisms with six-sided 

 pyramids (Fig. 108). Colours deep green, 

 pale green and light blue. They are asso- 

 ciated with zircon and feldspar, in a gangue 

 of calcareous spar. Many of the speci- 

 mens are remarkable for the proofs which 

 they exhibit of having undergone fusion sub 

 sequently to the time of their formation. 

 Sometimes the terminations are rounded ; 

 and at others, the whole crystal is bent as in 

 the accompan)ring Figs. 110 and 111. The 

 crystals also have a glassy appearance on 

 the surface. I have observed the same rounded terminations in some of the specimens from 

 Orange county. Dr. Emmons considers this as one of the proofs in favour of his theory 



of the igneous origin of primitive limestone.* 

 Compound crystals similar to that represented in 

 Fig. 112, have also been obtained at the preced- 

 ing locality. 



About a mile southwest of the village of Gou- 

 vemeur, six-sided prisms have been found in the 

 limestone, from four to six inches in length, and 

 having a sea-green or mountain-green colour, as- 

 sociated with scapolite and smoky quartz. These 

 crystals sometimes have' the form of the uniannu- 

 laire of Haiiy. Fig. 113. M on a? 129° 13' 53" ; 

 P on a; 140° W 1". At present, however, it is 

 not easy to obtain good specimens at this loca- 

 lity. 

 Small but well defined six-sided crystals of this species are found accompanying sphene, 

 pargasite, pyroxene and feldspar, in the town of Rossie, two miles north of the village of 

 Oxbow. They are bluish green and translucent. Small sky-blue crystals have also been 

 obtained from the limestone in the neighborhood of the village of Rossie, in this county. 



Fig. 112. 



• NtUfYmk Oeohgicd lUparU, 1838. 



