Crumb. Aggregate material with a crumbly
shape.3. Groundmass
TYPES OF MICROSTRUCTURES (cont.)
Aggregate microstructures
Crumb. Aggregate material with a crumbly
shape.
Granular. With granular aggregates.
In sub-angular blocks. With aggregates
in sub-angular blocks.
In angular blocks. With aggregates in
angular blocks.
Prismatic. In prismatic aggregates.
Due to the size of the aggregates, they are very difficult to see in thin
sections.
Platy. With platy aggregates.
Compound microstructures
Complex. Formed of heterogeneous areas
with more than one type of structure.
Neither aggregate nor sandy microstructures
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