92
i Manual of Lithology, page 302; John Wiley, New York.
ROTTENSTONE.
Rottenstone is the name applied to a porous, light rock,
consisting principally of very fine silica and iron oxide. It is
the product of decomposition of siliceous, ferruginous limestone,
the carbonate of lime having been leached out.
According to E. H. Williams 1 rottenstone is sometimes
produced by the weathering of loose calcareous mica-schist,
low in carbonate of lime and mica.
USES.
Rottenstone is used as a polishing material in the finishing
of varnished surfaces of furniture, pianos, etc., and in polishing
celluloid goods and plate glass.
Amount of rottenstone used in the manufacturing in
dustries, as reported by the consumers:—
Location
No. of firms
reporting
consumption
Domestic
Imported
Tons
Tons
Maritime Provinces
2
A
Quebec
6
—
H
Ontario
53
—
10H
Prairie Provinces
1
—
A
British Columbia
3
—
Canada (Total)
65
—
12