i6 FOURTH FLOOR 



The loan collection of the New York Mineralogical Club, con- 

 taining a large proportion of the minerals which have been found 

 on Manhattan Island and in the immediate vicinity, occupies Case 

 27. Case 28 (in the northeast corner of the hall) is devoted to 

 several series introductory to the study of mineralogy, such 

 as models of crystal forms and specimens to illustrate the exact 

 meaning of the various descriptive terms used in the science. 



To the west lies the Gem Room (Xo. 403). The gem collec- 

 tion consists of the exhibits made by the Tiffany Company at 

 Gems and the Universal Expositions held at Paris in the years 

 Gem 1889 and 1900. It was given to the Museum by 



Material. ^[^^ ^lorgan, who frequently adds to the collection. 

 Especially noteworthy are the series of Corundums (Sapphires), 

 Topazes, Beryls, Garnets and Tourmalines. These show a 

 variety in color and tone that is not generally familiar to the 

 public. Uncut gem materials and crystals are exhibited in con- 

 nection with the gems. Observe the assemblage of cut and carved 

 semi-precious stones, such as Rhodonite, Jadeite and Jade, and 

 several forms of Quartz, especially Rock-crystal and Amethyst. 

 Several masses of Amethyst are among the most remarkable that 

 have been ,' und. The Morgan Collection of gold coins of the 

 United States is here, containing a nearly complete series of the 

 issues from the Philadelphia mint. 



The Copper Queen case exhibits a wonderful series of speci- 

 mens donated by the Copper Queen Consolidated Alining Com- 

 Copper pany from their mines at Bisbee, Arizona. Note 

 Queen especially the large specimens of "velvet" and ordi- 

 Collection. j-^ary Malachite and Azurite, the green and blue car- 

 bonates of copper which for many years formed the sole ores of 

 the mine. 



Continuing toward the west the visitor next enters the hall 

 of Mexican and Central American Archaeology (No. 402), known 

 as the Loubat Hall, on account of the preponderance of material 

 presented to the IMuseum by the Duke of Loubat. 



The key-diagram at the east entrance will assist the visitor 

 in orienting himself in regard to the hall. 



