1894] 



Meteoric Stone found in Neiv Zealand. 



145 



II. Percentage Composition of the Enstatite. 



Si0 2 54-46 



MgO 22-761 



FeO 16-74 ' 



CaO 4-17 



MnO 0-39 



A1 2 3 0-21 



K 2 O 0-15 



NajO 1-12 



LioO . trace . 



Oxygen. 



28-87 



14-51 



100-00 



This corresponds very closely with the typical enstatitic formula 

 R"0'SiO 2 , and shows that all the olivine had been extracted. 



III. Percentage Composition of the Olivine (including Glass and 

 Substance resembling Glass). 



SiO 2 40-68 



MgO 35-64 



FeO 22-06 



CaO , . 1-16 



MnO . 0-29 



A1 2 3 



0-17 



Oxygen. 

 21-56 



19-62 



100-00 



This corresponds approximately with the typical formula of an 

 olivine, 2R"0"Si0 2 . The deviation from the typical formula is prob- 

 ably chiefly due to solution of part of the finely-divided enstatite 

 during the separation of the olivine by means of hydrochloric acid, 

 and may partly arise from the solution of the other constituents 

 mentioned by Professor Ulrich, " glass and a substance resembling 

 glass." 



IV. Alkalies. 



The various determinations made of the alkalies were consistent in 

 indicating that the alkali present is essentially soda, and that the soda 

 is almost wholly, if not solely, present in a mineral constituent which 

 is only slightly attacked by water, alcohol, ether, or dilate hydro- 

 chloric acid. 



