380 MM. W. C. Broffffer <md G. vom Rath on certain 



Berlin, 1861). Professor N. Story Maskelyne found this 

 mineral in the Busti meteorite (Trans. Roy. Soc. clx. 189). 

 Professor von hang showed, in an admirable investigation, 

 how rich were the combinations of* the enstatite of the Breiten- 

 bach meteorite. Nearly at the same time vom Rath deter- 

 mined the crystals of hypersthene of Laach. The specimens 

 from both these sources, cosmical and terrestrial, have abso- 

 lutely the same angles. Implanted crystals of enstatite pre- 

 senting freely formed crystalline faces had hitherto been un- 

 known in plutonic rocks. It might be thought that if they 

 could be found they might astonish us by their gigantic size, 

 like the olivines of Snarum; and in this expectation we are 

 not disappointed. 



In the apatite mine of Kjorrestad between Krageroe and 

 Langesund, in the autumn of the year 1874, enstatite was 

 discovered in crystals of a size reached only by very few mi- 

 nerals. The locality where the great enstatite crystals have 

 been found is one of those numerous apatite veins of Southern 

 Norway. The main rock of this part of the coast is mica and 

 amphibole slate, in which the apatite veins are included. Their 

 predominating mineral is amphibole. 



In the vicinity of these normal veins there is to be found at 

 the Hankedalsvand, not far from Yestre Kjorrestad, an isolated 

 deposit, as a thick lode constituted principally of large crys- 

 tals of enstatite and enormous masses of rutile. There was 

 not much apatite, but some greenish-white mica and talc : and 

 for this reason apatite was obtained only for a short time. 

 The enstatite crystals, from (J '3 to 0*4 metre in size, had 

 been thrown away unheeded, till they were discovered by 

 Brogger and Reusch in their researches on the apatite beds 

 {Zeitschr. d. dentsch. geol. Gesellsch. vol. xxvii. p. (546, 1875). 

 As the mine of Yestre Kjorrestad had been already abandoned, 

 the investigations of the discoverers w T ere confined to the matter 

 thrown out. 



The enstatite crystals, occurring in more or less elongated 

 columnar forms always broken at one end, were no doubt origi- 

 nally implanted on the wall of the lode. The space between 

 the gigantic enstatite crystals was filled with silver-white or 

 light-green talc. Also in the interior, and principally in the 

 decomposed crust of the enstatite, we see minute scales of talc, 

 lying in planes parallel to the prismatic faces, or oftener to the 

 brachypinakoid, formed evidently by a metamorphosis of the 

 enstatite. 



The new crystals excite our attention at first by their size. 

 Several crystals attain a magnitude of 20 centims. in length 

 and in breadth. One of the two largest specimens measures 



