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 THE WORLD'S MINERALS. l. j. spencer. 



With Forty Coloured Plates and Twenty-one Diagrams. 



The text of this book on minerals is in the main descriptive of the 116 species of the 

 more common simple minerals, which are illustrated by 163 figures on the coloured 

 plates. Descriptions of a few other important species have been added. Technical 

 terms are explained in the preliminary chapters ; ■ their use, however, has been 

 avoided as far as possible, and an attempt has been made to present in popular 

 language an interesting and readable account of the several kinds of minerals. The 

 forty coloured plates have been prepared under the supervision of Dr. Hans Lenk, 

 Professor of Mineralogy and Geology in the University of Erlangen, and many of 

 the pictures represent actual specimens belonging to the mineral collection under his 

 charge. 

 W. & R. Chambers, Ltd., 38 Soho Square, London, W., and Edinburgh. 



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