16 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 1n the science. 
To the west lies the Gem Room (No. 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. Mr. Morgan, 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 Stat-s 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 Mining Com- 
Copper pany from their mines at Bisbee, Arizona. Note 
Queen especially the large specimens of “velvet”? and ordi- 
Collection. nary 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 Archeology (No. 402), known 
as the Loubat Hall, on account of the preponderance of material 
presented to the Museum by the Duke of Loubat. 
The key-diagram at the east entrance will assist the visitor 
in orienting himself in regard to the hall. 
