OCCURRENCE OF TINGUAITE AT KOSCIUSKO, N.S.W. 351 



akmite. He has also described phonolite from Mt. Kenia and its 

 neighbourhood, containing anorthoclase, nepheli'ne, augite, aegirine 

 and acmite. 



G. Rose, 1 Rosenbusch,and van Werveke have described nepheline 

 bearing rocks from Messid Gharian, from the great volcanic cone 

 of Tekut, and from Mantrus, all situated in Tripoli. These are 

 mostly dark grey phonolites with idiomorphic nepheline laths of 

 sanidine and pyroxene ; sodalite hornblende and haiiyne with 

 titanite, magnetite and apatite are present in some varieties. 



J. Roth, has described a sanidine-augite-haiiyne phonolite with 

 a little nepheline from Kordofan. 2 



Velain has described a nepheline phonolite from the peninsula 

 of Aden, 3 occurring in sheets, flows, and dykes. Nepheline, 

 sanidine, plagioclase, green augite and magnetite compose it. 

 Velain considers these phonolites to be newer than the rhyolites 

 and trachytes of the same neighbourhood. 



Steinecke 4 has described a phonolite rich in biotite but poor in 

 nepheline, from between Choi and Kosehkserai Marand in Persia. 



In North America nepheline rocks of the nature of phonolites 

 have been described from Dakota and Colorado. 5 



In South Dakota they form conspicuous conical hills, such as 

 Mato Tepee, the core of a laccolith. 6 



A curious type of phonolite rich in hornblende, and terme 

 apachite has been described by Osann,from the Apache Mountains. 7 



1 G. Eose, Z. Geol. Ges. in., 1851, 105. 



2 J. Eoth, Allg. u. Chem. Geologie n., 262. 



3 Velain, Descript. Geol. de la presq 'ile d' Aden, 1878, 35. 



4 Steinecke, Phonolith aus Persien, Z. f. Naturw. 4, Folge, vi., 1887,45. 



5 Whitman Cross, Proc. Colorado Scientifi. Soc, 1887, 167. 



6 Some of- the principal phonolite localities in U. S. America, are Big 

 Bull Mountain ; Mitre Peak ; Straub Mountain ; Ehyolite Mountain ; 

 Florissant and Manitou; Bull Cliff ; Washington Shaft, Victor. 



7 Osann, Phonolite (Apachite) of the Apache Mountains, U.S.A. — 

 Tschermak's Min. u. petr. Mitt., 1896, Vol. xv., p. 394. Eosenbush, 

 Microscopische Physiographie der Mineralien und Gesteine, dritte 

 Auflage 1896, p. 823. 



