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