PALLASITE. -CUMIiERLAXDITK. 75 



lowish metallic particles are to be seen. The microscopic and chemical examination 

 showed that the rock was composed of nickeliferous iron, pyrrhotite, chromite, olivine, 

 and bronzite. The nickeliferous iron forms tlie cenientin;^ mass, in a fine irrej^ular net- 

 work. In the finer meshes lie single crystals, and in coarser portions are inclosed ag<^e- 

 gated grains and crystals of the above mentioned minerals. Th's iron is of a very light 

 steel gray color, and, on etcliing its surface, shows under the microscope figures somewhat 

 similar to those of the Senegal iron. 



The olivine forms more or less perfect crystals, which occur both in the iron and as 

 intergrowths with the bronzite. The olivine was determined by the crysUilhjgniphic 

 measurements of Professor Viktor von Lang to be of the same form as ba.saltic olivine. 

 It is on the surface of a bluish-gray to a berlin-blue color, but in tiie thin section pale 

 green. 



Under the microscope no well marked cleavages were seen, Ijut undulating fissures 

 parallel to the basal pinacoid are common. Many of these cracks are bordered by a moss- 

 like black mineral, which Tschermak regards as chromite, arising from a secondary altera- 

 tion of the olivine. Judging from the figure given, the present writer would agree in 

 this particular with Tschermak. 



The bronzite occurs in grains and irregular crystals. From its crystal lographic char- 

 acters, as determined by Von Lang, it appears to be enstatite, the same as the bronzite 

 in the Breitenbach meteorite. The enstatite has an asparagus-green to a yellowish- 

 green color, and under the microscope is of a very pale green shade. It is traversed by 

 the usual cleavage and fissure lines, and contains inclusions of three different kinds. The 

 first is in the form of colorless rounded grains, which are regarded as feldspar. The next 

 class of inclusions are minute, round, black particles, which are referred to chromite. 

 The last class are fine hair-like bodies, like those commonly seen in terrestrial bronzite, 

 but whose nature w^as not determined by Tschermak. 



The pyrrhotite was seen united with the iron, and often between the silicates in yel- 

 low grains having a metallic lustre. 



The chromite occurs in black crystals and grains, possessing a strong semi-metallic 

 lustre. The planes of an octahedron, rhombic dodecahedron, and tetragonal triakis octa- 

 hedron were observed by Von Lang upon the chromite crystals. It was found in small 

 amounts between the silicate, and also in the iron. For a fuller description and the 

 figures, the reader is referred to the original paper with its accompanying plate.* It is 

 doubtful whether this meteorite should be placed here, or classed with the peridot ites. 



Variety. — Curaberlandite. 



Iron Mine Hill, Cinnberlund, lihode Island. 



No. 998. A dark resinous, almost black, crystalline grouiulmass, holding, porphy- 

 ritically inclosed, long, striated, glassy, and milky plagioclase crystals. Powder strongly 

 magnetic. This rock has been exposed on one side to weathering, and shows a dark 

 brown mass holding grains of magnetite, and gives an earthy yellow streak. In some of 

 the unaltered portions, the groundmass has the oil-green color of olivine. The fracture 



* Sitz. Wien. Akad., 1S70. Ixi. (3), 405-475. 



