58 
EAST WING. 
General stones. It was in ancient times worked in Egypt, as is proved 
SSeiSr rough specimens found in the old workings by Sir 
Gardner Wilkinson, and presented by him to the Museum. 
Emeralds are found in the Urals ; but the locality for the finest 
stones has long been that of Muso, about seventy miles from 
Santa Ee de Bogota, in South America. Lately emeralds, though 
not of a good colour, have been discovered at Stony Point in 
North Carolina : some of the best of those found are shown in 
the case. Facetted specimens of the colourless beryl, and also 
of the bluish-green beryl, known in jewellery as Aquamarine, 
are exhibited (30a). 
In cases 30e to 32d will be found beautiful illustrations of the 
Zeolite group of minerals. 
Tourmaline (33a), when free from flaws, is, in some of its 
varieties, to be classed with the precious stones. Among these 
is the pink variety called Eubellite. Two very fine specimens 
of rubellite from Ava are shown in the case; one of them, 
remarkable for its size and shape, was brought from that country 
by Colonel Symes, to whom it had been presented by the king ; 
the other, not so large but of a deeper colour, was presented to 
the Museum by Mr. C. S. J. L. Guthrie. The pink-and-green 
tourmalines from Maine, U.S.A., are among the more beautiful 
of the mineral products of the United States. Good examples 
of the blue tourmaline, Indicolite, are shown in case 33b. 
Haiiynite (34b), in its rich blue variety, is the Lapis Lazuli 
of jewellery, and is brought from Persia, China, Siberia, and 
Bokhara. When powdered, lapis lazuli furnished the once 
costly pigment ultramarine ; through the discovery of a method 
of producing an artificial and cheap form of the same material, 
the use of the mineral as a pigment has been quite superseded. 
The sulphates of strontium, Celestine (35c), of barium, Barytes 
or Heavy Spar (36a), and of lead, Anglesite (36e), are all repre- 
sented by long series of specimens. 
Gypsum or Selenite (36f ) is the hydrated sulphate of lime : 
when heated it gives up its water of crystallisation and falls to a 
white powder, known as " Plaster of Paris " ; when moistened 
the powder again combines with water and forms a coherent 
solid. A magnificent crystallised specimen, a gift from the late 
Prince Consort, will be found in the Pavilion. Gypseous ala- 
