638 NEW YORK STATE MUSEUM 



The range of constitutents in brick clays from various states can 

 be seen from the following table. 



North Carolina 



Range Average 



Silica 52 . — TO 60^ 



Alumina 13 —28 18^ 



Ferric oxid 1.5 — 11.5 60^ 



Lime , .1— 2.5 .60^ 



Magnesia , 1 — 1.5 .40^ 



Alkalis 2—4.5 20^ 



Water 4—12 Y^ 



Total fluxes 3.5 — lY. 5 9^ 



Missouri 



Range Average 



Silica and fluxes combined.. 12 — 30 15^ 



SHica (sand) 20 — 60 55^ 



Alumina , 11 — 25 14^ 



Water (combined) 3 — 9 4^ 



Water (moisture) — 6 2^ 



Eerricoxid 2.5 — 8 4^ 



lime .5—7 1.50^ 



Magnesia 3 — 8 Ifo 



Alkalis 2 — Y 3.50^ 



New York 



Range Average 



Silica 45.12 — 69. Y3 54.28/. 



Alumina 11.33 — 24.45 18.81^ 



Eerricoxid 1.90—10.90 5.92^ 



lime 23 — 15.38 4.87^ 



Magnesia 10— 8.24 2.95^ 



Alkalis .48 — 9.82 5.43^ 



Water 90 — 12.67 6.906^ 



Moisture 4.50— 8.26 5.41^ 



