Andesite at Serian Hill

It was identified by Geological Department that the rock found at the Serian Hill, Andesite. This rock is another most common igneous rock after Granite and Basalt. To identify the rock type, microscope is required to identify the minerals (petragraphy). When cut open, the surface  is very smooth, and the colour is light bluish and grey, fine grained and crystallised.
The name Andesite originated from the South America's Andes and is associated with lava flows or volcanic activities.