66 RESOURCES OF CALIFORNIA. 
in the valley of Santa Clara River, near its head ; and near 
San Juan Bautista, Monterey county. The most abundant and 
most accessible supply is that near Clear Lake. 
Alum is found in Santa Clara county, eastward of San José; 
near Lancha Plana and Campo Seco, in Calaveras county; at 
the Geysers, and at Owen’s Lake. At the two last-named 
places there are hot alum-springs. 
“Three miles above the forks of Clear Creek, in Shasta coun- 
ty, there are twenty salt-springs. 
Springs strong with sulphate of magnesia, or Epsom salts, 
are found at the Geysers. 
Chalk is found in Amador county and in Sonoma county. 
Suisun marble, the most beautiful form of sulphate of lime, 
is found in Solano county. Gypsum is found in Santa Cruz 
and Amador counties. Fine specimens of alabaster have been 
obtained in El Dorado and Monterey counties. 
Fine varieties of porcelain clay exist in many of the mining 
counties, particularly in Tuolumne. Clay, suitable for making 
fire-brick, may be obtained near Richmond, in Honey Lake 
valley. 
Chromium is found on the bank of Feather River, near the 
mouth of Nelson Creek; near the town of Nevada; on the 
bank of Bear River, above Anson’s Ferry; and on the ridge 
between the North and Middle Forks of the American River. 
Chrome iron is found in Monterey county. 
During the summer and fall, in many parts of the state, a 
saline efflorescence covers the earth, or those low parts of it 
where water collects during the rains of winter. This efflo- 
rescence is composed chiefly of carbonate and borate of soda, 
mixed with various other salts. The largest deposit of this 
kind is probably found at Soda Lake, at the sink of the Mojave 
River. . 
California is very rich in borax, and the day is probably not 
far distant when we shall supply a large amount of it to com- 
merce. It is found in springs in Tehama county, and in springs 
and lakes in Napa county. One of these lakes covers a hun- 
