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| Type of Rock: | Magma: | Texture: | Mineralogy: |
| Igneous rock | Extrusive (magma reaches the surface to become lava). | Aphanitic (fine grained) | Dominant mineral: Amphibole. Intermediate plagioclase feldspar. |
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THIN SECTION A thin section is made by grinding down a slice of rock which has been glued to a glass slide until it reaches a thickness of about 0.03mm (30 microns). At this thickness most minerals become more or less transparent and can therefore be studied by a microscope using transmitted light. |
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