51 
tites of the same mineral from the Copper Queen Mine, Arizona;^ 
among the silicates, Case 8A, the large crystals of Amazon stone 
from Pike’s Peak, Colorado, and. Case loB, the transparent and per- 
fect crystals of topaz from Siberia; among the phosphates, Case 
15, the richly colored vanadinites from Arizona, and among the 
sulphates. Case 16, the brilliant groups of celestite from Sicily. 
Case 13.— A collection of natural and polished specimens of 
agatized wood from Arizona. 
Case 14. — A large display of the beautiful rubellite in lepido- 
lite from San Diego County, California, and some massive gypsum 
crystals from the cave in Wayne County, Utah, which was 
recently opened by Prof. J. E. Talmage, of Salt Lake City. These 
crystals are of remarkable size, some being nearly four feet in 
length, and are nearly transparent. 
Case 1 7 A.— Following the end of the systematic collection in 
Room 64 is a small collection of pseudomorphs, which illustrates 
the way in which one mineral may imitate or replace another. 
Cases 17B and C.— A series illustrating the physical prop- 
erties of minerals, such as form, structure, diaphaneity, lustre, 
hardness, and specific gravity. 
Cases 17 D, E, and F.— A series of crystal models, repre- 
senting the typical forms and position of the axes in the six sys- 
tems of crystallization. Together with these are a number of 
models of crystals of the more common mineral species, and some 
of the crystals themselves. The models are mounted in their true 
crystallographic position, and are intended to illustrate not only 
the proper position, but also the distinctive crystal forms which 
characterize the common minerals. 
Case 17G.— A series of models of famous gold nuggets. 
Cases 18 and 19.— Gem minerals, showing in the native 
state the minerals which are the source of gems and ornamental 
stones. 
Case 20.— A small collection of cut stones is contained in 
this case. Others may be seen in Hall 32 of the Department of 
Industrial Arts. 
Case 21. — Slab of lapis lazuli from Peru, said to be the 
largest single block ever quarried. 
Case 22. — Group of amethyst crystals from Thunder Bay, 
Lake Superior. 
