Geoscience Reference
In-Depth Information
3.15 Metamorphic and igneous rock types
•
The grain sizes are more appropriate (measurable) for the assessment of the sed-
imentary rocks. However the size is shown in the table below for comparison
purposes.
•
Igneous rocks are formed when hot molten rock solidifies. Igneous rocks are
classified mainly on its mineral content and texture.
•
Metamorphic rocks are formed fromother rock types, when they undergo pressure
and/or temperature changes. Metamorphic rocks are classed as foliated and non
foliated.
Figure 3.3
Preliminary engineering concerns of various rock types for durability, slope stability and
excavatability. Aggregate and stones are seldom selected on basis of rock type alone.
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