MINERALOGY. 467 



The same region lias aftbrdcd a uumber of rare minerals, including the 

 beryllium phosphate, herderite, and the beryllium silicate, phenacite. 

 (Described by E. S. Dana in Amer. Journ. Sci., 1888, vol. xxxvi, p. 290). 



BiicMnfjite. — Announced by G. Linck as a new iron sulphate from 

 Tierra Amarilla, near Copiapo, Chili. A further study has proved it to 

 be identical with roemeiite, and in a later paper he describes it under 

 this name. The material has allowed of a more perfect crystallographic 

 and chemical investigation than has hitherto been possible. (Jahrb. 

 tiir Min., Vol. i, 213, 1888; Zeitschr. fiir Kryst., 1888, vol. xv, p. 22). 



Calciothorite. — See Barkevikite. 



Calciostrontianite. — A name given by Cathrein to a calcium-bearing 

 strontianite from Brixlegg, Tyrol, and corresponding to the mineral 

 " from Massachusetts" called by Thomson in 1836 emmonite, after Prof. 

 E. Emmons. 



Cliffonite. — A form of graphitic carbon found in the meteoric iron of 

 Youndegin, West Australia (discovered 1881). It occurs in minute 

 cubic crystals imbedded in the iron, and separated by dissolving the 

 iron in acid. The average thickness of the larger crystals is one- 

 hundredth of an inch. The cubic planes predominate, but dodecahedral 

 faces were also noted. They are black in color ; the hardness is 2.5, 

 and the speciiic gravity 2.12. They were proved chemically to be pure 

 carbon, and they resemble graphite in most of the characters except 

 form and greater hardness. These observations are of interest in view 

 of the recent discovery of carbon, having the hardness of the diamond 

 in a meteoric stone (noted above), and also the earlier observations of 

 Haidinger on isometric crystals of carbon, supposed to be pseudomorph 

 after pyrite in the Arva iron. Cliftonite is named after Prof. R. B. Clif- 

 ton, of Oxford, by L. Fletcher, in the Mineralogical Magazine, 1887, 

 vol. VIT, p. 121. 



Cristobalite. — A form of silica in minute octahedal crystals found at 

 the tridymite locality of Cerro San Cristobal, near Pachuca, Mexico. 

 They are associated with tridymite in cavities in andesite. It is not 

 certain whether they rei)resent an allotropic form of silica, or as seems 

 more probable a pseudomorph after some mineral in isometric octahe- 

 drons. A cubic form of silica (melanophlogite) wasfound by Lasaulxon 

 the sulphur of Girgenti. Cristobaliie is described by G. vom Eath in 

 the Jahrb. Min., 1887, vol. i, 198. 



BahlUtc. — A mineral of remarkable composition, since it contains both 

 calcium phosphate and calcium carbonate; it is in fact the first case in 

 which a phosphate and carbonate occur in the same species. The nat- 

 ural suggestion that the carbonate is present as impurity only, in the 

 form of calcite, is regarded by the describers as inapplicable, since their 

 microscopic examination convinced them of its homogeneity; Dahllite 

 occurs as a rather thin crust, having a rounded lustrous surface and a 

 fibrous structure, the fibers being perpendicular to the underlying base 

 of massive reddish apatite. In color it is pale yellowish wliite or reddish 



