Table 1.—U.S. production of synthetic mullite 
 
 QuantityYear  (short 
Value 
(thou- 
tons) 
sands) 
1981_________________ 
 
1982_________________ 
 
1984e 
 
1985e________________ 
eRatjma~j 
 
 
 
 
CONSUMPTION AND USES 
PRICES 
600 
MINERALS YEARBOOK, 1985 
 
 
son-Walker Refractories at Eufaula, AL. duced by Sohio Electro Electric-furnace-fused
mullite was pro- Niagara Falls, NY. 
Minerals Co. at 
 
 
 
 Kyanite and related materials were con sumed mostly in the manufacture of
highalumina or mullite-class refractories and in lesser quantities as ingredients
in ceramic compositions. U.S. kyanite, already ground to minus 35 mesh as
required by the flotation process used in its separation and recovery, was
marketed either in this raw form or, after heat treatment, as mullite, sometimes
further reduced in particle size before use. In the 35- to 48-mesh range,
kyanite was used mostly in monolithic reEngineering and Mining Journal, December
1985, listed prices for raw kyanite, f.o.b. Georgia, ranging from $92 to
$144 per short ton for bulk shipments and $9 more per ton for bagged material.
These prices were unchanged from those of 1984. 
 42,000 $9,050 
 27,000 5,950 
 23,000 4,700 
 27,000 5,300 
 27,000 5,450 
 
 
fractory applications such as high-temperature mortars or cements, ramming
mixes, and castable refractories, or with clays and other ingredients in
refractory compositions for making kiln furniture, insulating brick, firebrick,
and a wide variety of other articles. More finely ground material, minus
200 mesh, was used in body mixes for sanitary porcelains, wall tile, investmentcasting
molds, and miscellaneous specialpurpose ceramics. 
 
 
 
 
 
 Prices in 1985, in British pounds, from Industrial Minerals (London) were
the same as those of 1984. The price increases in U.S. dollars of 12% in
table 2 reflect a corresponding increase in the value of the British pound
against the U.S. dollar.2 
 
 
Table 2.—Prices of kyanite and related materials 
(Dollars per short ton) 
 
1984 
1985 
Andalusite,Transvaal,52% 8454% A1,O~,bulk, c.if. main Europeanport      
       
Andalusite,Transvaal, 60% A1203,c.i.f. mainEuropeanport                 
    
Silhimanite,SouthAfrican,70% A120,,bags, c.i.f. mainEuropeanport        
       
U.S. kyanite, 59% to 62% A120,, 35-325 Tyler mesh, raw and/or calcined, 18-ton
lots, c.i.f. mainEuropean port                                          
     
U.S. kyanite, f.o.b. plant, carlots: 
Calcined                                                       
79 
102 
215 
 
102-176 
 
123-172 
89 
114 
241 
 
114-197 
 
123-172 
Raw                                                          
70-137 
70-137 
Source: Industrial Minerals (London). No. 219, Dec. 1985, p. 101.