2.  In this presentation we will be focusing
on the soil colour description and the silt
and clay fractions (in %).
 We will be using graphs to differentiate
the soil variables, focusing on soil colour,
silt and clay fraction in percentages.

3.  Soil colour comes from a swarm of things,
most likely, the chemical composition,
the type of bedrock that is underlain, or
the type of bedrock upslope/upstream
from where the soil was deposited and
the organic content.

4.  RED SOIL:
 Red colours are due to the presence of Fe3+ or
ferric compounds and indicate that the soil is
well aerated.
 It indicates the accumulation of iron oxide.
 Mineralogy of this soil type is hematite
(Hematite is one of the most common minerals.
The colour of most red and brown rock, such as
sandstone,) and lepidocrocite (This mineral
often occurs as an inclusion within quartz
crystals. Its colour is reddish brown to a darker
red, and this may vary, as it depends on what
the type of quartz it is included in.)

5.  WHITE SOIL:
 White indicates the predominance of
silica (quartz), or the presence of salts.
 Light coloured soils may be leached (soil
constituents such as organic matter,
clay, or iron move downward with
percolating water faster than they are
added from overlying horizons), or
contain high amounts of calcium
carbonates.

6.  Mineralogy of this soil type is calcite
(Calcite is a rock-forming mineral with a
chemical formula of CaCO3. It is
extremely common and found
throughout the world in sedimentary,
metamorphic and igneous rocks.)
 And dolomite (is a common sedimentary
rock-forming mineral)

7.  YELLOW SOIL:
 Yellow soils signify intermediate aeration.
 The mineralogy of yellow soils are goethite
(is a frequent matrix material for other more
aesthetic minerals. It is usually an ugly dark
mineral, though specimens from a handful
of locations).
 And jarosite (Secondary mineral, forming
under conditions of weathering in arid
climates, Colourless to white in colour.)

8. 75%
22%
3%
Red
Yellow
White

9. 437.43
125.98
19.58
0
50
100
150
200
250
300
350
400
450
500
Red Yellow White
Siltandclayfractions(in%)
Soil Colour