MINEKALOGY. 467 



The same region has aflorded a iiuinbor of rare minerals, including the 

 beryllium phosphate, berderite, and the beryllium silicate, pheuacite. 

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



Biickingite. — 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 pai)er he describes it under 

 this name. The material has allowed of a more perfect cry stallographic 

 and chemical investigation than has hitherto been ])ossible. (Jahrb. 

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



Co Icio th ori te. — ^ee B a r k e \' i k i t e . 



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

 strontianite from Brixlegg, Tyrol, and corresponding to the mineral 

 " from Massachusetts" called by Thomson in 1830 emmonite, after Prof. 

 E. Emmons. 



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

 iioundegiu, West Australia (discovered 1884). 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 specific 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 crystalsof carbon, supposed to be pseudomorj)!! 

 after pyrite in the Arva iron. Cliitonite is named after Prof. K. B. Clif- 

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

 vol. VIT, i>. 121. 



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

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

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

 certain whether they rejjresent 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) was found by Lasaulx on 

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

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



DahlUte. — 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 honu)geneity. 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. Jn color it is pale yellowish white or leddish 



