No. 50.J 77 
Fluor spar — In the limestone near Rochester ; in cubes, which are 
sometimes of a bluish tint. 
Pearl spar, having the crystals bent and twisted — Rochester. 
Calcareous spar, usually in dodecahedrons — ^With the preceding. 
Sulphate of magnesia, sulphate of iron, muriate of soda and alum — 
Found in the form of effloresences on rocks. 
Snowy gypsum in nodules — Rochester. 
Sulphate of bary tes, of a flesh red color. In nodules in limestone — 
Rochester. 
Sulphate of strontian — Sometimes found with the preceding. 
Garnet sand — Associated with iron sand on the shores of Lake On- 
tario. 
Iron pyrites — Abundant. 
MONTGOMERY COUNTY. 
Few minerals have hitherto been found in this county. The most 
important, perhaps, is marl, which is said to occur in several places, 
and in considerable abundance. 
Mining operations, however, have been prosecuted to some extent, 
with a view to the opening of veins of lead ore which have been dis- 
covered on Flat creek, near Spraker's Basin. Good specimens of this 
ore have been obtained at this locality, but the question whether it ex- 
ists in any quantity, is still undecided. 
The following minerals have also been found to occur in this coun- 
ty, viz : 
Calcareous tufa, calcareous spar, stalactite, &c. — Mitchell's cave. 
Sulphate of barytes, the lamellar variety. 
Brown spar. 
Anthracite — In small seams, and also inclosed in quartz crystals. 
Quartz, crystallized, sometimes having one end globular and smooth, 
as if fused ; also calcedony and agate. 
Garnet, of pink colour — In the gneiss at the Noses. 
Sulphuret of zinc — Associated with galena. 
Oxide of titanium — In minute crystals in calcareous spar, near Spra- 
kers. Mather. 
