These represent the particular residual clay formed by the
weathering of bauxite rocks yielding a product in which silica (SiO2)
has been largely eliminated and aluminium and iron hydroxides predominate. The changes,
which bring about its formation, appear to be peculiarly characteristic of the
tropics. Two typical analyses of residual Laterite are given below. The first
one is of American origin and the second one is from Nalhati in India. In India
lateritic clays containing very high proportion of iron are known as Morum and
these are chiefly used in road making. They are very sticky when wet but become
quite hard when dries up.
Country
|
American
|
Indian
|
SiO2
|
35.14
|
38.2
|
Al2O3
|
40.12
|
43.38
|
TiO2
|
0.7
|
No
|
Fe2O3
|
4.12
|
2.12
|
CaO
|
0.45
|
4.43
|
MgO
|
0.21
|
0.53
|
H2O
|
17.84
|
11.85
|
Non soluble matter
|
1.48
|
No
|
Total
|
100.06
|
100.51
|
 |
| Click on the image for the best view |
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