THE TRAP MINERALS OF NOVA SCOTIA—GILPIN. 289 
some localities on Lake Superior, I believe that rock holding one- 
half of one per cent. of copper is successfully treated by stamp- 
ing and washing. I am not aware that attention has been 
directed to our trap with a view of determining if the metal be 
present under these conditions, 
Dr. Dawson mentions the gray sulphuer of copper as occurring 
at Indian Point. 
Antimony. The sulphide of this metal oceurs at Margaret- 
ville in small quantities in trap. 
Our attention isnow more partcularly directed to those miner- 
als whose presence in great numbers and beautiful forms has 
made our trap celebrated among mineralogists. It is stated that 
Mysore in India alone rivals it in the variety and abundance of 
its minerals. 
These belong to the Fifth division of Dana’s mineralogy— 
oxygen compounds-—and may be subdivided into Binary oxygen 
compounds of the carbon-silicon group—and various subdivi- 
sions of the silicate section of the Ternary oxygen compounds. 
Oxides of the Carbon Silicon group—series 2. 
Quartz. The varieties of this mineral may be divided into 
two groups. The first comprising all ordinary vitreous quartz, 
the second the massive flint-like varieties. 
First group. Rock crystal. This form frequently occurs in 
trap lining cavities, by itself, or forming a basis for other mi- 
nerals. 
Amethyst. This is found at many places both in the massive 
state, and in the characteristic crystals. It is frequently found 
with magnetite, in some cases penetrating it. Its colour varies 
from a faint violet to deep purple, and is generally considered 
due to the presence of manganese. But analyses have shown the 
absence of this element, and the colour has been considered to 
arise from minute qualities of compounds of iron and soda. 
Smoky quartz or Carrngorm stone. This occurs with amethyst 
in the trap, but the largest and best known specimens are from 
the granite of Paradise, Annapolis County. 
Some of the quartzcrystals of Nova Scotia are said to show 
