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Igneous rock: Obsidian small
Granite is an igneous rock which consists of the minerals quartz, feldspar (alkali feldspar or plagioclase) and mica (biotite or Muscovite). It is formed by the underground solidification of magma which is why it belongs to the abyssal rocks. The size of the crystals in granite is related to the cooling time of the magma. The longer it took to cool, the greater the crystals have grown.
Quartz is the hardest component in granite and it is usually greyish white in color. Plagioclase feldspar has a creamy color, alkali feldspar is more pink. The softest component is the gleaming mica which is recognizable by the thinlayered structure. In weathered stones this can become somewhat brownish.
Granite occurs world-wide. In Scandinavia, however, there are large areas where various types of granite appear at the surface. Fragments have been spread as erratic stones all over Northern Europe during the ice ages.
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