1348 MINERALS ' YEARBOOK, 1941
 In 1941 the principal commercial producer of grinding pebbles and tube-mill
liners was the Jasper Stone Co., Sioux City, Iowa, which marketed liners
and artificially rounded quartzite pebbles from near Jasper, Minn. In California,
John C. Momand, Carlsbad, again produced beach pebbles (mostly of granite,
with no flint pebbles) ; the Crystal Silica Co., Los Angeles, an~ the Ocean
Rock & Sand Co., Oceanside, also sold some grindingpebbles. Charlotte
Chemical Laboratories, Inc., Charlotte, N. C., which in 1940 operated as
the Southern Products & Silica Co., produced granite liners, rounded
granite cubes, and mifiedsilica (quartz) pebbles; the Harris Granite Quarries
Co., Salisbury, N. C., marketed both liners and rounded granite cubes; and
Peeler & McCombs, Faith, N. C., sold granite pebbles and liners. Quartzite
liners were produced by J. Howard Swaim, 918 Cotton States Bldg., Nashville,
Tenu., from deposits near.Iron City, Tenn.
 Texas flint pebbles were marketed in 1941 by Philip S. HQyt, Columbus, Tex.,
and the Dezendorf Marble Co., Austin, Tex.; these pebbles are said to be
nearly as tough as the Danish pebbles formerly imported. Philip S. Hoyt produced
some liners also. Another new source was the Baraboo Quartzite Co., Baraboo,
Wis., which produced quartzite pebbles in Sauk County, Wis.
 In 1942 Texas pebbles are being marketed also by The Richard L. Cawood Co.,
1250 St. George St., East Liverpool, Ohio. Grinding p~bbles produced near
Elmore, Ala., are sold through the Great Lakes Foundry Sand Co., United Artists
Bldg., Detroit, Mich.

NATURAL SILICA ABRASIVES.

 Pumice and pumicite.—Sales of pumice and pumicite in 1941 rose to
117,310 short tons valued at $669,514—an all-time high in both quantity
and value; they were 42 percent greater in tonnage than in 1940 and 32 percent
above 1939, the previous record year. The total value in 1941 surpassed by
49 percent the 1940 high of $449,914. This large increase reflects both the
greater use of pumice as a concrete aggregate in building and the more careful
preparation of domestic pumice and its acceptance by consumers in place of
the highquality abrasive grades formerly imported.

Pumice and pumicite sold or used by producers in the United States, 1937—41
Year
Short tons
Value
Year
Short tons
Value
1937                 
1938                 
1939                
71,007
65,742
89, 159
$301, 936
312,886
424,780
1940                 
1941                 
82,407
117,310
$449, 914
669,514
 Production of pumice and pumicite in 1941 was reported from California,
Kansas, Nebraska, New Mexico, Oklahoma, Oregon, and Texas (see fig. 4).
 Pumice and pumicite used for concrete aggregate and admixture increased
in 1941 to 56,159 short tons, or 155 percent above the 1940 figure. Use in
acoustic plaster was .32 percent greater than in 1940. Consumption in abrasives,
however, was slightly less than in 1940, although the value increased 62
1percent—49,031 tons valued at $392,364 in 1941 compared with 50,195
tons valued at -$242,331 in
1940 (see fig. 5).