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General Notes. 
MINERALOGY AND CRYSTALLOGRAPHY. 
Development of Faces on Crystals.—Gaubert? makes a con- 
tribution to the subject of the growth of crystal faces by means of his 
experiments with the alums. An octahedron of chrome alum, on solu- 
tion in its mother liquor, is rounded at its edges and angles. When 
the solution becomes again saturated, and the crystal begins to grow, 
faces of the forms (100), (110), (211) and (221) are developed, but 
disappear on continued growth, leaving finally only the octahedron 
(111). Experiments with crystals of chrome and potassium alum 
prove that the same faces are developed when the rounding is done 
mechanically instead of by solution. Potassium alum from pure water 
gives the form of octahedron and cube, but by rounding (211) and 
(221) may be caused to grow. 
1 Edited by Prof. A. C. Gill, Cornell University, sina N. X: 
? Bull. Soc. Fr. Min., XVIII, pp. 141-143, 1895. 
