192 Washington — Kaersutite from Linosa and Greenland. 



Si0 2 .... 



40-85' 



•681 



Ti0 2 .... 



8-47 



•106 



Zr0 2 ._.. 



none 





A1 2 3 ... 



... 9-89 



•097 



Fe 2 3 .... 



... 8*85 



•056 



FeO .... 



3 96 



•055 



MnO... 



12 



•002 



NiO -.-. 



.,„. o-io 



•001 



MgO .:.. 



12-47 



•312 



CaO 



12-16 



•217 



BaO .... 



none 





Na 2 ... 



. _. 2-01 



•032 



K 2 .... 



0-63 



•007 



H 2 .... 



0-19 



•010 



F_ 



0-28 



•007 



99-98 

 Hornblende from Linosa.* Washington, analyst. 



In its general features, this analysis closely resembles many 

 analyses of basaltic hornblendes, such as those made by Schnei- 

 der.f Alumina is, however, decidedly lower, and a most strik- 

 ing character is the very high percentage of Ti0 2 , the amount 

 of which is nearly twice that reported for most basaltic horn- 

 blendes. The character of the material used for the analysis 

 precludes the possibility that this high figure is due to admix- 

 ture of titaniferous magnetite or ilmenite, as no appreciable 

 amount of such inclusions could have been present, so that the 

 titanium must be regarded as belonging to the hornblende 

 molecule. The analysis will be discussed later, in connection 

 with others, and attention need be called here only to the fig- 

 ures for the iron oxides and the percentage preponderance of 

 ferric over ferrous oxide. 



The Kaersut Amphibole. 



Occurrence. — A peculiar, highly titaniferous amphibole 

 from Kaersut, Nugsuaks Peninsula, on the shore of Umanak 

 Fjord, Greenland, was described by J. Lorenzen,^ who called 

 it kaersutite. According to Steenstrup (as quoted by Loren- 

 zen), the kaersutite occurs in a vein or dike, 2 to 6 inches 

 wide, which cuts a horizontal sheet of peridotite 120 feet 

 thick. It is accompanied by plagioclase, titaniferous ore, an 

 astrophyllitelike mica, and some pyrite, with zeolites, calcite, 

 and quartz as secondary minerals. This sheet of peridotite is 



* This analysis has been published in Rock Minerals, by J. P. Iddings, 

 New York, 1906, p. 330. 



fC. Schneider, Zeitschr. Kryst., vol. xviii, p. 580, 1890. 



I J. Lorenzen, Medd. Groenland, vol. vii, p. 27, 1884. 



