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Sample: LM4 fragment of rock
Location: Agnaou Gate-Marrakesh
Type of material: schist (shale)
Macroscopic data
(directly on the fragment)
Colour: grey
Stratigraphy: almost invisible
Cohesion: moderate to scarce
Microscopic data
(on thin section)
MATRIX
Nature: micaceous.
Colour: light brown (at parallel polars), greenish grey (at crossed
polars).
Texture: slightly oriented
AGGREGATE
Nature: siliceous (mono and polycrystalline quartz), illitic-muscovite.
Granulometry: from fine-grained (size range 0. 1 - 0.25 mm) to
very fine-grained (size range 0.05 -0.01 mm)
GENERAL CHARACTERISTICS OF ROCK
External: slight cleavage is present with oxides (dark in the section
examined).
Conclusions:
the rock observed is a grey shale, with cleavage and fine-grained aggregate.
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