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Bureau of Mines / Minerals yearbook: Metals and minerals 1977
Year 1977, Volume 1 (1977)

Potter, Michael J.
Feldspar, nepheline syenite, and aplite,   pp. 375-381 ff. PDF (789.5 KB)


Page 376

376 MINERALS YEARBOOK, 1977 
substantial tonnages of feldspathic sands (feldspar-quartz mixtures) enter
into glass furnace feeds with no further reduction in particle size. Feldspar
to be used in ceramic and filler applications is usually pulverized to minus
200 mesh or finer. In 1977, 14 U.s. companies operating 16 plants produced
feldspar in 10 States for shipment to destinations in at least 24 States,
Puerto Rico, Canada, and Mexico. North Carolina had five plants, California
had two, and the other producing States had one plant each: 
Arizona, Colorado, Connecticut, Georgia, Maine, Oklahoma, South Dakota, and
Wyoming. In October of 1977, Indusmin, Ltd., of Canada purchased all shares
of LawsonUnited Feldspar and Mineral Co., Spruce Pine, N.C., through its
subsidiary, American Nepheline Corp., Columbus, Ohio.3 Indusmin produces
nepheline syenite at Nephton, Ontario. In Maine, operation of the feldspar
mill at West Paris was to resume in the spring of 1978 under the new owner,
Oxford Feldspar and Mineral Corp. 
Table 2.—Feldspar produced in the United States 
(Thousand short tons and thousand dollars) 
 H d bbed  Flotation Feldspar-silica T tal2 
Year an -Co concentrate mixtures1 0 
Quantity Value Quantity Value Quantity Value Quantity Value 
 1973 53 636 546 9,789 193 2,406 792 12,830 1974 46 412 580 8,784 137 2,199
763 11,396 1975 17 274 531 9,260 122 2,193 670 11,728 1976~ 28 321 601 13,606
111 3,603 740 17,531 1977~ 23 309 568 12,602 142 4,276 734 17,186 
1Feldspar content. 
2Data may not add to totals shown because of independent rounding. 
3Value datarepresent a more refined product and are not comparable to those
of previous years. 
Table 3.—Feldspar sold or used by producers, by use 
 1976 1977 
Use Quantity  Value Quantity  Value (short tons) (thousands) (short tons)
(thousands) 
Hand-cobbed: 
 Glass 100 $4 -- -- Pottery w w w w 
 Other 26,903 925 24,600 $988 
 Total 27,003 929 24,600 988 
Flotation concentrate: 
 Glass 401,899 8,474 309,233 6,652 
 Pottery 180,200 4,827 w w 
 Other 731 13 259,644 7,982 
 Total 582,830 13,314 568,877 14,634 
Feldspar-silica mixture:1 
 Glass 89,679 2,911 104,851 3,208 
 Pottery W W w W 
 Other 31,301 1,232 36,293 1,665 
 Total 120,980 4,143 141,144 4,873 
Total: 
 Glass 491,678 11,389 414,084 9,860 
 Potte7 221,740 6,102 253,375 7,755 
 Other 17,395 895 67,162 2,880 
 Total 730,813 18,386 734,621 20,495 
 W Withheld to avoid disclosing individual company confidential data; included
with "Other." 
 ' Feldspar content. 
 ' Includes soaps, abrasives, sanitary ware, rubber, electrical insulators,
etc.; totals for "Quantity" and "Value" do not correspond
to the sums of
the subtotals of the three "Other" categories above. 


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