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NEW YORK STATE MUSEUM 



pit, so as to tap the lenses in depth, has cut large pockets of it, 

 enough to form the entire wall on one side. The fluorite is white 

 and has disseminated magnetite. It is near the lower workings 

 of the Lovers pit. When this pit was in active operation it en- 

 countered a peculiar, dense, green rock in small amount which, the 

 microscope showed, consisted of quartz and actinolite. It con- 

 tained scattered masses of fluorite of pink and green colors and up 

 to 2 inches in diameter. 



The most interesting fluorite of all, was however by chance 

 obtained in one of the quarries in the Grenville limestone just 

 north of Port Henry. A rather insignificant crust of dull yellow- 

 ish color, proved to be this mineral, filled with the wormlike 

 growths, technically called '' helminths." The commonest hel- 

 minths are chlorite in quartz, but of what those in the fluorite 

 consist is not known. 



Helminths of some unknown mineral in fluorite. Actual field abDut .05 inch 



Garnet occurs in the North and South pits on Barton hill in 

 excellent rhombic dodecahedra which are at times distorted so as 

 to be greatly flattened. Aside from this occurrence well crystal- 

 lized garnets have not been observed, but massive specimens of 

 the mineral are not uncommon in both anorthosites and basic 



