giving the formula 2CaO, H 2 0, P 2 5 . It is associated with crys- 

 tallized gypsum and calcite, and with the following species. 



Monue is massive, slightly coherent, and wholly uncrystalline. 

 It is snow-white, earthy arid dull, with hardness below 2, and 

 specific gravity about 2.1. In the closed tube it emits /nuch 

 moisture, and in the blow-pipe flame melts with difficulty to an 

 opaque white enamel. 



A' mean of analyses, after deducting an admixture of gypsum, 

 gave 



41.92 51-15 6.93 



corresponding to Ca 3 ? 2 O s +H,0. 



It resembles kaolinite, and is a hydrated tricalcic phosphate. 



Uranothallite.— Schrauf 1 has named the variety of Liebig- 

 ite from Joachimsthal, analyzed long ago by Vogl and Lin- 

 dacker, Uranothallite. It contains more lime than Liebigite, and 

 its composition may be represented by the formula Ca 2 UC 4 ]2 

 + 10 aq. It occurs in minute aggregated crystals and grains, 

 often scaly, and has a green color and streak. It is translucent, 

 has a vitreous lustre except on the cleavage face, where it is 

 pearly, and is soluble in acids. The crystals are too imperfect 

 to give satisfactory measurements. 



Chiolite and Chodneffite. — Professor P. Groth, of Strass- 

 burg, has undertaken the revision of the natural compounds of 

 fluoric acid, the analysis being performed by Mr. Brantl, of Mu- 

 nich, and, as one of the first results, announces the identification 

 of Chodneffite with Chiolite. Three analyses of perfectly pure 

 Chiolite gave : 



yielding the formula 5 NaF +3 AlF ; ,. 



the former analyses of Rammelsberg were made upon massive 

 " nc '-y^alli/.e<l fragments, some of which had a composition like 

 "at given above, but from which the formula 3NaF+2AlF :i 

 was deduced ; other portions, however, being richer in sodium 

 and Poorer in aluminium, and for these the formula 2NaF+AlF :i 

 VVa p co . ns tructed and the name Chodneffite given. 

 Professor Groth now show, th ses of Ram- 





