PETROLOGICAL ABSTRACTS AND REVIEWS 285 



KoLDERUP, Carl Fred, og Ottesen, P. O. "Utsires fjeldbygning 

 og bergarter," Bergens Museums Aarbok, 1911, Nr. 17, pp. 21. 

 Utsire is a small island off the west coast of Norway. About four- 

 fifths of the rock of which it is composed is gabbro, and one-fifth is 

 ' ' granodiorite. ' ' A small amount of gneiss was found. An analysis of the 

 " granodiorite " shows but 0.25 per cent of K2O, and on the mechanical 

 separation of the constituents by means of heavy solutions, no orthoclase 

 was found, the constituents being 50 per cent plagioclase (labradorite 

 7 per cent and oligoclase 43 per cent), 42 per cent quartz, 8 per cent 

 hornblende, and accessory biotite, iron minerals, and garnet. The rock 

 would better be called a quartz rich quartz diorite. » j 



Koto, B. "On nephelite-basalt from Yinge-men, Manchuria," 

 Jour. Coll. Sci., Imp. Univ. Tokyo, XXXII (191 2), Art. 6, 

 pp. 14, pi. 2. 



This is the first recorded occurrence of nephelite basalt in the 

 Japanese-Korean-Chinese region. It is found in the Yinge-men area, 

 forming low hills, and was probably poured out from the junction between 

 the granite country rock and the overlying Cambrian formation. Its age 

 was not determined. The rock is megascopically porphyritic with 

 minute olivine phenocrysts. Under the microscope its texture is nearly 

 holocrystalline, a very small amount of a brownish, granulated, or 

 fibrous base occurring. The minerals, in the order of their abundance, 

 are: titanaugite, magnetite and titaniferous magnetite, nephelite (30 

 per cent), and olivine (15 per cent). Picotite is an accessory. Neither 

 feldspar nor apatite occurs. According to the quantitative system of 

 Cross, Iddings, Pirsson, and Washington the rock is a shonkinose- 

 monchiquose, the norm giving 45 . 5 per cent feldspar, 1 1 . 9 per cent 

 nephelite, 23 per cent diopside, 1.4 per cent olivine, 7.4 per cent mag- 

 netite, 5 . 5 per cent ilmenite, and i . o per cent apatite. a t 



Kraus, Edward H. "Die Aenderungen des optischen Axen- 



winkels im Glauberit mit der Temperatur," Zeitschr. f. Kryst., 



LII (1913), 321-26. 



So long ago as 1829 Brewster showed that the optic axial angle of 



glauberite was changed with change of temperature. Kraus shows that 



the mineral is uniaxial for sodium light at 42 ?9 and for lithium light at 



51 ?8. The curves show that, like gypsum, with increasing temperature 



the angle becomes less and less until the zero value is reached, after which 



increasing temperature enlarges it. A. J. 



