26 NEW YORK STATE MUSEUM 



A new locality for brookite was found by Mr C. A. Hartnagel in 

 the limestone exposure at Indian Ladder, Albany co., two speci- 

 mens being obtained as the result of a careful search. These occur 

 embedded in calcite, differing in this respect from the Ellenville 

 occurrence, to which, in other respects, they bear a marked re- 

 semblance. The crystals are very small, the larger measuring i mm 

 in length. 



A hitherto unnoted locality for tourmalin in the vicinity of Fort 

 Ann was visited and several specimens obtained. The largest of 

 these is a broken black crystal embedded in quartz and measuring 

 30 cm in length and 20 cm in diameter. Although showing no ter- 

 mination, it is well developed in the prismatic zone and shows the 

 typical cross-section for tourmalin. A smaller specimen measuring 

 8 cm in length and 10 cm in diameter shows several well defined 

 planes of the termination. 



Some large orthoclase phenocrysts were obtained from a pegma- 

 tite exposure i^ miles northwest of Crown Point Center, Essex co. 

 They occur in a coarsely crystalized matrix of quartz and ortho- 

 clase and show well defined crystal outlines. The largest of these 

 phenocrysts measures 21 by 6 cm. 



A number of large and well developed crystals of calcite were 

 collected from the old eupychroite deposits i mile south of Crown 

 Point. The calcite from this locality crystallizes in twinned rhom- 

 bohedrons of the form R (ion) the largest of which measures 

 7.5 cm on edge. In the twinning habit they resemble the calcite 

 from Rossie and other St Lawrence county localities, the twinning 

 plane being parallel projections observed on the rhombohedral 

 faces proved to be the incipient development of a twinning parallel 

 to a hypothetic plane — ^ R. The crystals which are in general 

 clear and colorless are in many instances thickly coated with stal- 

 actitic calcite. 



A fine series of 140 calcite specimens was collected by the State 

 Geologist from Perce rock, Gaspe, Can. These are clear to milky 

 white in color and are superficially colored in many instances by a 

 thin coating of a flesh-colored to red deposit of iron oxid derived 

 from hematite. Barite and fluorite also occur associated with the 

 calcite. The occurrence which presents some interesting crystallo- 

 graphic combinations, may be made the subject of a more detailed 

 description. 



The attention of the Assistant State Geologist was recently di- 

 rected to the occurrence of fine calcite crystals in a limestone quarry 



