138 



NEW YORK STATE MUSEUM 



In every instance the most characteristic specimens under 

 each species are to be found in the front row and are therefore 

 best available for detailed study; the back row contains dupli- 

 cates, massive specimens, and in general, material requiring - less 

 close examination. In most instances where the crystallization 

 is of interest and importance wooden models are placed at the 

 head of the species; these are followed by the best examples 

 of crystallization available, crystalline masses and massive forms 

 following the order given in the descriptive text. 



An introductory collection illustrating the text of part 1 of 

 this guide is displayed in the table cases of the southern half 

 of the mineralogic section. *" 



The student is also referred to a collection of minerals of 



economic importance at present displayed in the table cases 



of the northern half of the mineralogic section. The material 



here displayed is grouped under the following divisions: 



Nonmetalliferous division (cont'd) 

 2 Salt, potash, soda, borax and 

 alum 



Metalliferous division 

 A Metalliferous ores 



1 Arsenic antimony and bis- 



muth minerals 



2 Gold minerals 



3 Silver minerals 



4 Mercury minerals 



5 Copper minerals 



6 Dead minerals 



7 Zinc and cadmium minerals 



8 Tin minerals 



9 Nickel minerals 



10 Uranium and chromium 



minerals 



11 Iron minerals 



12 Manganese minerals 



13 Aluminium minerals 



Nonmetalliferous division 



B Substances used for chemical 

 purposes 

 1 Sulfur, sulfuric and hydro- 

 fluoric acids 



3 Magnesium, strontium, tita- 



nium and thorium com- 

 pounds 



4 Plaster of paris 



5 Substances used in the 



manufacture of chemical 

 compounds 

 C Ceramic materials 



1 Porcelain, earthenwares and 



bricks 



2 Pottery and glassware 

 D Refractory materials 



1 Graphite 



2 Asbestos 



3 Mica 



E Materials of physical application 



1 Abrasives 



2 Graphic materials 



3 Pigments 



4 Fertilizers 



