REPORT OF THE DIRECTOR IQTO 25 



the following species were not previously represented in the col- 

 lections : 



Native lead from Langban, Sweden; the larger of the two speci- 

 mens is exceptionally fine, presenting a surface of metallic lead 

 10 cm by 7 cm in extent. 



Melanotekite from Langban, Sweden ; a characteristic specimen 

 of this rare mineral. 



Pinakiolite from Langban, Sweden ; a large characteristic speci- 

 men of this rare manganese borate. 



Broggerite frc^n Satersdalen, Norway; a rare crystallized variety 

 of uraninite represented by a well-formed crystal 9 mm in diam- 

 eter. 



Aeschynite from Tveland, Norway; a niassive specimen of this 

 rare niobate. 



3 A representative series of minerals from the pegmatite 

 exposed at Kinkel's quarry, Bedford, Westchester co., was col- 

 lected during the past sunnner. This accession contains a fine mi- 

 crocline crystal, 19x8x7 cm, which shows with clearness twinning 

 according to the Baveno law. Alany smaller crystals, some of 

 them developed with almost diagrammatic regularity, form part of 

 this suite. Several specimens of cyrtolite. which has been described 

 from this locality by Luquer,^ add value to this series, some of 

 them being coated with distinct crystals of the relatively rare min- 

 eral autunite. From a specimen of clear rose quartz two perfect 

 spheres, 13 mm in diameter, have been cut, showing the asterism 

 noted in connection with this occurrence by Manchester. 



Calcites of Nezv York, by Mr Whitlock, the monograph on this 

 subject which has been mentioned in two preceding reports, has 

 been published as Museum memoir 13. The aim of this work is 

 to discuss the problem of the influence of genetic conditions upon 

 the crystal habit of calcite by means of a close and detailed com- 

 parison of the habit of a number of calcite occurrences within the 

 limits of New York State with special reference to the genetic con- 

 ditions governing the formation of the crystals comprised in these 

 occurrences. The summary of the results of this study indicate a 

 consistent recurrence of closely related crystal forms in three groups 

 of occurrences, in each group of which the governing genetic con- 

 ditions are similar, notwithstanding the fact that the occurrences 

 of the group are in most instances widely separated geographically. 



1 Luquer, L. McI. Am. Geo!. 1904. 33:17. 



