654 MINERALS YEARBOOK
article. Ground pumice is used in the electroplating industry; in tumbling
barrels; in cleansing, scouring, and polishing compounds; in dental preparations;
and as an abrasive in rubber erasers. Pumice is used in construction as a
lightweight concrete aggregate, in the manufacture of bricks and other building
units, as building blocks having fireproof and earthquake-proof qualities,
and as an ingredient in acoustic plasters. It is used also as a heat- and
sound-insula,ting medium.
 Pumice is reported to be used in Japan in the pottery industry and in Armenia
as a raw material in the manufacture of green bottle glass, the alkali present
effecting economies in the use of sodt~ and sulphates.
 Pumicite is used in making cleansing and scouring compounds, abrasive hand
soaps, and, to a limited extent, metal polishes. It is used in construction
as an admixture in concrete, as an absorbent for oiled-road surfaces, and
to a smaller extent as an insulating material for packing steam and water
pipes, lagging boilers, and lining cold-storage rooms, in filter cells, and
as a ifiler or absorbent in paints, sweeping compounds, and fertilizers.
 Production from the Middle Western States consists entirely of pumicite,
much of which is sold for cleansing and scouring compounds and as an admixture
in concrete. Production from the Far Western States includes both pumice
and pumicite. Imports of pumice, chiefly from the Island of Lipari, have
retarded the development of pumice in the Western States for use in eastern
markets. (See the table of imports under the section entitled "Foreign Trade"
for current data.) The total domestic production for the last 5 years is
stated in~ the following table.

Pumice and pumicite sold or used by producers in the United States, 19~d8—3f~

Year
Short tons
Value
Year
Short tons
Value
1928

57, 430
67,013
56,843
$278,516
353,064
336,099
1931                 
1932                 
68,819
53,214
$338, 586
235, 204
1929                  
1930                  






 The companies reporting production and sales of pumice and pumicite in the
United States in 193 1—32, with the location of the deposits from which
the pumice and pumicite were obtained, are as follows:

 Brown, Chas., Shoshone, Calif. Deposit at Shoshone, Inyo County, Calif.
California Quarries Corporation, 1300 Quinby Building, Los Angeles, Calif.
Deposit near Laws, Mono County, Calif.
 Cudahy Packing Co, 111 Monroe Street, Chicago, Ill. Deposits at Fowler,
Meade County, Kans., and at Saltdale, Kern County, Calif.
 Davidson Pumice Co., Norton, Kans. Deposit at Calvert, Norton County, Kans.
 Earlonite Mining Co., Box 474, Selma, Calif. Deposit near Friant, Fresno
County, Calif.
 Glendenning, R. W., 1134 Western Pacific Building, Los Angeles, Calif. Deposit
at Shoshone, Inyo County, Calif.
 Golden State Cleaner Mine (M. L. Francis), R.F.D., Creston, Calif. Deposit
near Paso Robles, San Luis Obispo County, Calif.
 Hill Brothers Chemical Co., 2159 Bay Street, Los Angeles, Calif. Deposit
at Barstow, San Bernardino County, Calif.
 Kalite Co., Ltd., 90 South Oak Knoll Avenue, Pasadena, Calif. Deposit near
Calipatria, Imperial, Calif.