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Rock forming minerals in
thin section
Optical properties of minerals using
normal light
1. Color
2. Color change
3. Relief
4. Crystal shape
5. Cleavage
6. Fracture
color change
(
Relief
)
Medium RELIEF
LOW RELIEF
HIGH RELIEF
(
Shape
)
prismatic
Stalactitic
Radiating
Nodular
granular
‫متوسطة‬ ‫تضاريس‬
Medium RELIEF
Fracture
(
cleavage
)
Two
direction
One direction
twining
Repeated twinning
twining
Crosshatch twinning in
microcline
Simple twinning
XPL
(
Extention
)
PPL
Parallel extension
inclined extension
PPL
Minerals in thin section
Carbonates
1 Dolomite
-
2
-
3
4. Calcite
1
4
2
3
Olivine
1
-
Olivine XPL
2
-
Olivine
PPL
3
-
Olivine
XPL
3
2
Mafic minerals
Hornblende
Garnet
XPL
PPL
2
3
4
-
Muscovite
Biotite
PPL
XPL
1
2
4
3
Potassium feldspars
Microcline
Sanidine
4 2
1
3
Plagioclase feldspar series
1
-
2
-
Anorthite
3
-
4
-
Anorthoclase
4
3
1
2
Sedimentary rocks samples
Ortho – conglomerate
BRECCIA
Ortho quartzite
sandstone -
dolomite
limestone
limestone
Arenite sandstone-
Arkoze sandstone
GRAYWAKE
Ferrignas sandstone-
Black sand
Chert

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Editor's Notes

  1. Pleochroism