628 PETROLOGICAL ABSTRACTS AND REVIEWS 



3 inches in length, and smaller black augites. In thin section the rock is 

 seen to be composed of analcite, nephelite, plagioclase (probably AbiAni), 

 barkevicite, titanaugite, ilmenite, and apatite. The rock may be 

 regarded as an ijolite in which the greater part of the nephelite has been 

 displaced by original analcite, and in which barkevicite is a prominent 

 constituent as well as augite. 



The rocks of the second class are theralite, essexite, and kylite. The 

 latter rock consists of about 3 1 per cent labradorite, 4 per cent nephelite, 

 1.3 per cent, analcite, 26 per cent titanaugite, 32 per cent olivine, 3.3 

 per cent ilmenite, i . 7 per cent biotite, o . 7 per cent apatite. Mega- 

 scopically it is compact, fresh, phanerocrystalline, rather fine grained, 

 and of a grey or greenish-grey color. In thin section the phenocrysts are 

 seen to be olivine, titanaugite, and plagioclase, the latter in places zonal 

 and ranging from Ab4Ans to AbsAn3. A little orthoclase occurs. A 

 chemical analysis is given. 



Rocks of the third type are alkali dolerites. 



Albert Johannsen 



Watson, Thomas L., and Hess, Frank L. " Zirconif erous Sand- 

 stone near Ashland, Virginia, with a Summary of the Proper- 

 ties, Occurrence, and Uses of Zircon in General," Univ. Virginia 

 Pub., Bull. Phil. Soc. Charlottesville, I (191 2), 267-92. 



Watson, Thomas L. "Kragerite, a Rutile-bearing Rock from 

 Krageroe, Norway," Amer. Jour. Sci., Fourth Series, Vol. 

 XXXIV, 509-14. 



Kragerite was briefly described by Brogger in 1904 as a new member 

 of the aplite series and a differentiation product of a gabbro magma. 

 As described by Watson the rock is megascopically medium-grained 

 granitic, and light in color. The prominent constituents are light-grey 

 and pink feldspar, black rutile, and a little quartz. The rutile is in small 

 grains partly disseminated but mostly segregated along roughly parallel 

 lines which give the rock a streaked or banded appearance. The 

 minerals are albite-oligoclase predominant with a little microcline and 

 orthoclase, rutile, and a little quartz and ilmenite. In the rutile-rich 

 portion rutile is predominant accompanied by biotite partly altered to 

 chlorite, apatite, and an altered mineral probably feldspar. The rock 

 occupies a new position in the quantitative system. 



E. R. Lloyd 



